Plants having altered agronomic characteristics under nitrogen limiting conditions and related constructs and methods involving genes encoding LNT2 polypeptides and homologs thereof

ABSTRACT

Isolated polynucleotides and polypeptides and recombinant DNA constructs particularly useful for altering agronomic characteristics of plants under nitrogen limiting conditions, compositions (such as plants or seeds) comprising these recombinant DNA constructs, and methods utilizing these recombinant DNA constructs. The recombinant DNA construct comprises a polynucleotide operably linked to a promoter functional in a plant, wherein said polynucleotide encodes an LNT2 polypeptide.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. Application Ser. No. 12/264,990, filed Nov. 5, 2008 and currently pending, which claims the benefit of U.S. Provisional Application No. 60/986,088, filed Nov. 7, 2007, the entire contents of which are hereby incorporated by reference.

FIELD OF THE INVENTION

The field of invention relates to plant breeding and genetics and, in particular, relates to recombinant DNA constructs useful in plants for conferring nitrogen use efficiency and/or tolerance to nitrogen limiting conditions.

BACKGROUND OF THE INVENTION

Abiotic stressors significantly limit crop production worldwide. Cumulatively, these factors are estimated to be responsible for an average 70% reduction in agricultural production. Plants are sessile and have to adjust to the prevailing environmental conditions of their surroundings. This has led to their development of a great plasticity in gene regulation, morphogenesis, and metabolism. Adaptation and defense strategies involve the activation of genes encoding proteins important in the acclimation or defense towards the different stressors.

The absorption of nitrogen by plants plays an important role in their growth (Gallais et al., J. Exp. Bot. 55(396):295-306 (2004)). Plants synthesize amino acids from inorganic nitrogen in the environment. Consequently, nitrogen fertilization has been a powerful tool for increasing the yield of cultivated plants, such as maize and soybean. Today farmers desire to reduce the use of nitrogen fertilizer, in order to avoid pollution by nitrates and to maintain a sufficient profit margin. If the nitrogen assimilation capacity of a plant can be increased, then increases in plant growth and yield increase are also expected. In summary, plant varieties that have a better nitrogen use efficiency (NUE) are desirable.

Activation tagging can be utilized to identify genes with the ability to affect a trait. This approach has been used in the model plant species Arabidopsis thaliana (Weigel et al., Plant Physiol. 122:1003-1013 (2000)). Insertions of transcriptional enhancer elements can dominantly activate and/or elevate the expression of nearby endogenous genes. This method can be used to identify genes of interest for a particular trait (e.g. nitrogen use efficiency in a plant), genes that when placed in an organism as a transgene can alter that trait.

SUMMARY OF THE INVENTION

The present invention includes:

In one embodiment, a plant comprising in its genome a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory element, wherein said polynucleotide encodes a polypeptide having an amino acid sequence of at least 50% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32, and wherein said plant exhibits increased nitrogen stress tolerance when compared to a control plant not comprising said recombinant DNA construct.

In another embodiment, a plant comprising in its genome a recombinant DNA construct comprising:

(a) a polynucleotide operably linked to at least one regulatory element, wherein said polynucleotide encodes a polypeptide having an amino acid sequence of at least 50% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; or

(b) a suppression DNA construct comprising at least one regulatory element operably linked to: (i) all or part of: (A) a nucleic acid sequence encoding a polypeptide having an amino acid sequence of at least 50% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32, or (B) a full complement of the nucleic acid sequence of (b)(i)(A); or (ii) a region derived from all or part of a sense strand or antisense strand of a target gene of interest, said region having a nucleic acid sequence of at least 50% sequence identity, based on the Clustal V method of alignment, when compared to said all or part of a sense strand or antisense strand from which said region is derived, and wherein said target gene of interest encodes an LNT2 or LNT2-like polypeptide, and wherein said plant exhibits an alteration of at least one agronomic characteristic when compared to a control plant not comprising said recombinant DNA construct.

In another embodiment, a method of increasing nitrogen stress tolerance in a plant, comprising (a) introducing into a regenerable plant cell a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence, wherein the polynucleotide encodes a polypeptide having an amino acid sequence of at least 50% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the recombinant DNA construct and exhibits increased nitrogen stress tolerance when compared to a control plant not comprising the recombinant DNA construct; and optionally, (c) obtaining a progeny plant derived from the transgenic plant, wherein said progeny plant comprises in its genome the recombinant DNA construct and exhibits increased nitrogen stress tolerance when compared to a control plant not comprising the recombinant DNA construct.

In another embodiment, a method of evaluating nitrogen stress tolerance in a plant, comprising (a) introducing into a regenerable plant cell a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence, wherein the polynucleotide encodes a polypeptide having an amino acid sequence of at least 50% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the recombinant DNA construct; and (c) evaluating the transgenic plant for nitrogen stress tolerance compared to a control plant not comprising the recombinant DNA construct; and optionally, (d) obtaining a progeny plant derived from the transgenic plant, wherein the progeny plant comprises in its genome the recombinant DNA construct; and optionally, (e) evaluating the progeny plant for nitrogen stress tolerance compared to a control plant not comprising the recombinant DNA construct.

In another embodiment, a method of evaluating nitrogen stress tolerance in a plant, comprising (a) introducing into a regenerable plant cell a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence, wherein the polynucleotide encodes a polypeptide having an amino acid sequence of at least 50% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the recombinant DNA construct; (c) obtaining a progeny plant derived from the transgenic plant, wherein the progeny plant comprises in its genome the recombinant DNA construct; and (d) evaluating the progeny plant for nitrogen stress tolerance compared to a control plant not comprising the recombinant DNA construct.

In another embodiment, a method of determining an alteration of an agronomic characteristic in a plant, comprising (a) introducing into a regenerable plant cell a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence, wherein the polynucleotide encodes a polypeptide having an amino acid sequence of at least 50% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the recombinant DNA construct; and (c) determining whether the transgenic plant exhibits an alteration of at least one agronomic characteristic when compared to a control plant not comprising the recombinant DNA construct; and optionally, (d) obtaining a progeny plant derived from the transgenic plant, wherein the progeny plant comprises in its genome the recombinant DNA construct; and optionally, (e) determining whether the progeny plant exhibits an alteration of at least one agronomic characteristic when compared, optionally under nitrogen limiting conditions, to a control plant not comprising the recombinant DNA construct.

In another embodiment, a method of determining an alteration of an agronomic characteristic in a plant, comprising (a) introducing into a regenerable plant cell a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence, wherein the polynucleotide encodes a polypeptide having an amino acid sequence of at least 50% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the recombinant DNA construct; (c) obtaining a progeny plant derived from the transgenic plant, wherein the progeny plant comprises in its genome the recombinant DNA construct; and (d) determining whether the progeny plant exhibits an alteration of at least one agronomic characteristic when compared optionally under nitrogen limiting conditions, to a control plant not comprising the recombinant DNA construct.

In another embodiment, a method of determining an alteration of an agronomic characteristic in a plant, comprising:

(a) introducing into a regenerable plant cell a suppression DNA construct comprising at least one regulatory element operably linked to:

-   -   (i) all or part of: (A) a nucleic acid sequence encoding a         polypeptide having an amino acid sequence of at least 50%         sequence identity, based on the Clustal V method of alignment,         when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32, or (B)         a full complement of the nucleic acid sequence of (b)(i)(A); or     -   (ii) a region derived from all or part of a sense strand or         antisense strand of a target gene of interest, said region         having a nucleic acid sequence of at least 50% sequence         identity, based on the Clustal V method of alignment, when         compared to said all or part of a sense strand or antisense         strand from which said region is derived, and wherein said         target gene of interest encodes an LNT2 or LNT2-like         polypeptide;

(b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the suppression DNA construct; and

(c) determining whether the transgenic plant exhibits an alteration of at least one agronomic characteristic when compared to a control plant not comprising the suppression DNA construct;

and optionally, (d) obtaining a progeny plant derived from the transgenic plant, wherein the progeny plant comprises in its genome the suppression DNA construct;

and optionally, (e) determining whether the progeny plant exhibits an alteration of at least one agronomic characteristic when compared optionally under nitrogen limiting conditions, to a control plant not comprising the suppression DNA construct.

In another embodiment, a method of determining an alteration of an agronomic characteristic in a plant, comprising:

(a) introducing into a regenerable plant cell a suppression DNA construct comprising at least one regulatory element operably linked to:

-   -   (i) all or part of: (A) a nucleic acid sequence encoding a         polypeptide having an amino acid sequence of at least 50%         sequence identity, based on the Clustal V method of alignment,         when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32, or (B)         a full complement of the nucleic acid sequence of (b)(i)(A); or     -   (ii) a region derived from all or part of a sense strand or         antisense strand of a target gene of interest, said region         having a nucleic acid sequence of at least 50% sequence         identity, based on the Clustal V method of alignment, when         compared to said all or part of a sense strand or antisense         strand from which said region is derived, and wherein said         target gene of interest encodes an LNT2 or LNT2-like         polypeptide;

(b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the suppression DNA construct and exhibits an alteration of at least one agronomic trait when compared to a control plant not comprising the suppression DNA construct;

(c) obtaining a progeny plant derived from the transgenic plant, wherein the progeny plant comprises in its genome the suppression DNA construct; and

(d) determining whether the progeny plant exhibits an alteration of at least one agronomic characteristic when compared to a control plant not comprising the suppression DNA construct;

and optionally, (e) determining whether the transgenic plant exhibits an alteration of at least one agronomic characteristic when compared, optionally, under nitrogen limiting conditions, to a control plant not comprising the recombinant DNA construct.

In another embodiment, the present invention concerns an isolated polynucleotide comprising: (a) a nucleotide sequence encoding a polypeptide, wherein the amino acid sequence of the polypeptide and the amino acid sequence of SEQ ID NO:18, 24, or 26 have at least 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity based on the Clustal V alignment method, or (b) the complement of the nucleotide sequence,

wherein the complement and the nucleotide sequence contain the same number of nucleotides and are 100% complementary. The polypeptide In an embodiment comprises the amino acid sequence of SEQ ID NO:18, 24, or 26, and the nucleotide sequence comprises the nucleotide sequence of SEQ ID NO:17, 23, or 25.

BRIEF DESCRIPTION OF THE FIGURES AND SEQUENCE LISTINGS

The invention can be more fully understood from the following detailed description and the accompanying drawings and Sequence Listing which form a part of this application.

FIG. 1 shows a schematic of the pHSbarENDs2 activation tagging construct used to make the Arabidopsis populations (SEQ ID NO:1).

FIG. 2 shows a schematic of the vector pDONR™ Zeo (SEQ ID NO:2), GATEWAY® donor vector. The attP1 site is at nucleotides 570-801; the attP2 site is at nucleotides 2754-2985 (complementary strand).

FIG. 3 shows a schematic of the vector pDONR™ 221 (SEQ ID NO:3), GATEWAY® donor vector. The attP1 site is at nucleotides 570-801; the attP2 site is at nucleotides 2754-2985 (complementary strand).

FIG. 4 shows a schematic of the vector pBC-yellow (SEQ ID NO:4), a destination vector for use in construction of expression vectors for Arabidopsis. The attR1 site is at nucleotides 11276-11399 (complementary strand); the attR2 site is at nucleotides 9695-9819 (complementary strand).

FIG. 5 shows a schematic of the vector PHP27840 (SEQ ID NO:5), a destination vector for use in construction of expression vectors for soybean. The attR1 site is at nucleotides 7310-7434; the attR2 site is at nucleotides 8890-9014.

FIG. 6 shows a schematic of the vector PHP23236 (SEQ ID NO:6), a destination vector for use in construction of expression vectors for Gaspe Flint derived maize lines. The attR1 site is at nucleotides 2006-2130; the attR2 site is at nucleotides 2899-3023.

FIG. 7 shows a schematic of the vector PHP10523 (SEQ ID NO:7), a plasmid DNA present in Agrobacterium strain LBA4404 (Komari et al., Plant J. 10:165-174 (1996); NCBI General Identifier No. 59797027).

FIG. 8 shows a schematic of the vector PHP23235 (SEQ ID NO:8), a vector used to construct the destination vector PHP23236.

FIG. 9 shows a schematic of the vector PHP20234 (SEQ ID NO:9).

FIG. 10 shows a schematic of the destination vector PHP22655 (SEQ ID NO:10).

FIG. 11 shows a typical grid pattern for five lines (labeled 1 through 5—eleven individuals for each line), plus wild-type control C1 (nine individuals), used in screens.

FIG. 12 shows a graph showing the effect of several different potassium nitrate concentrations on plant color as determined by image analysis. The response of the green color bin (hues 50 to 66) to nitrate dosage demonstrates that this bin can be used as an indicator of nitrogen assimilation.

FIG. 13 shows the growth medium used for semi-hydroponics maize growth in Example 18.

FIGS. 14A and 14B show the multiple alignment of the full length amino acid sequences of the Arabidopsis thaliana LNT2 polypeptide (SEQ ID NO:28) and the LNT2 homologs (SEQ ID NOs: 18, 20, 24, 26, 30, 32, 33, and 34).

FIG. 15 shows a chart of the percent sequence identity and the divergence values for each pair of amino acids sequences displayed in FIGS. 14A and 14B.

FIG. 16 shows the results from screening of Gaspe Flint derived maize lines under reduced nitrogen (1 mM KNO₃) and optimal nitrogen (6.5 mM KNO₃) conditions. Four events containing PHP29689 were evaluated for a number of traits. Event means were compared to that of the segregant nulls. A p-value ≦0.1 was used as the cut off.

FIG. 17 shows the results from screening of Gaspe Flint derived maize lines under reduced nitrogen (1 mM KNO₃) and optimal nitrogen (6.5 mM KNO₃) conditions. All events containing PHP29689 were considered in the analysis. For each variable, the construct mean was compared to that of the construct null. A p-value ≦0.1 was used as the cut off.

FIG. 18 shows the yield trial results for PHP28840-containing plants under low nitrogen conditions. The yield values in gray represent significant increases, and the yield values in black represent significant decreases. The remaining values represent non-significant differences.

FIG. 19 shows the yield trial results for PHP28841-containing plants under low nitrogen conditions. The yield values in gray represent significant increases, and the yield values in black represent significant decreases. The remaining values represent non-significant differences.

FIG. 20 shows the yield trial results for PHP28840-containing plants under normal nitrogen conditions. The yield values in gray represent significant increases, and the yield values in black represent significant decreases. The remaining values represent non-significant differences.

FIG. 21 shows the yield trial results for PHP28841-containing plants under normal nitrogen conditions. The yield values in gray represent significant increases, and the yield values in black represent significant decreases. The remaining values represent non-significant differences.

FIG. 22 shows the results of the NUE seedling assay for plants containing either PHP28840 (expression cassette=Int2-3) or PHP28841 (expression cassette=Int2-2).

The sequence descriptions and Sequence Listing attached hereto comply with the rules governing nucleotide and/or amino acid sequence disclosures in patent applications as set forth in 37 C.F.R. §1.821-1.825. The Sequence Listing contains the one letter code for nucleotide sequence characters and the three letter codes for amino acids as defined in conformity with the IUPAC-IUBMB standards described in Nucleic Acids Res. 13:3021-3030 (1985) and in the Biochemical J. 219 (2):345-373 (1984) which are herein incorporated by reference. The symbols and format used for nucleotide and amino acid sequence data comply with the rules set forth in 37 C.F.R. §1.822.

Table 1 lists certain polypeptides that are described herein, the designation of the cDNA clones that comprise the nucleic acid fragments encoding polypeptides representing all or a substantial portion of these polypeptides, and the corresponding identifier (SEQ ID NO:) as used in the attached Sequence Listing.

TABLE 1 Low Nitrogen tolerant proteins (LNT) SEQ ID NO: Amino Clone Designation Nucleotide Acid LNT2-like cpg1c.pk013.o6:fis 17 18 LNT2-like rca1n.pk001.f6:fis 19 20 LNT2-like sfl1n1.pk002.j1 21 LNT2-like sds1f.pk001.k5 22

SEQ ID NO:1 is the nucleotide sequence of the pHSbarENDs2 activation tagging vector (FIG. 1).

SEQ ID NO:2 is the nucleotide sequence of the pDONR™ Zeo construct (FIG. 2).

SEQ ID NO:3 is the nucleotide sequence of the pDONR™ 221 construct (FIG. 3).

SEQ ID NO:4 is the nucleotide sequence of the pBC-yellow vector (FIG. 4).

SEQ ID NO:5 is the nucleotide sequence of the PHP27840 vector (FIG. 5).

SEQ ID NO:6 is the nucleotide sequence of the destination vector PHP23236 (FIG. 6).

SEQ ID NO:7 is the nucleotide sequence of the PHP10523 vector (FIG. 7).

SEQ ID NO:8 is the nucleotide sequence of the PHP23235 vector (FIG. 8).

SEQ ID NO:9 is the nucleotide sequence of the PHP20234 vector (FIG. 9).

SEQ ID NO:10 is the nucleotide sequence of the destination vector PHP22655 (FIG. 10).

SEQ ID NO:11 is the nucleotide sequence of the poly-linker used to substitute the PacI restriction site at position 5775 of pHSbarENDs2.

SEQ ID NO:12 is the nucleotide sequence of the attB1 sequence.

SEQ ID NO:13 is the nucleotide sequence of the attB2 sequence.

SEQ ID NO:14 is the nucleotide sequence of the entry clone PHP23112.

SEQ ID NO:15 is the forward primer VC062 in Example 5.

SEQ ID NO:16 is the reverse primer VC063 in Example 5.

SEQ ID NOs:17-22 (see Table 1).

SEQ ID NO:23 is the consensus nucleotide sequence of a contig, referred to herein as PSO415619, containing BI316280 (NCBI General Identifier No. 14990607), CD401-485 (NCBI General Identifier No. 31459457) and sfl1n1.pk002.j1 (SEQ ID NO:21).

SEQ ID NO:24 is the amino acid sequence of the polypeptide encoded by PSO415619 (SEQ ID NO:23).

SEQ ID NO:25 is the consensus nucleotide sequence of a contig, referred to herein as PSO415620, containing CX548557 (NCBI General Identifier No. 57575582) and sds1f.pk001.k5 (SEQ ID NO:22).

SEQ ID NO:26 is the amino acid sequence of the polypeptide encoded by PSO415620 (SEQ ID NO:25).

SEQ ID NO:27 is the nucleotide sequence of the gene that encodes the Arabidopsis thaliana “unknown protein” (LNT2) (At5g50930; NCBI General Identifier No. 145359102).

SEQ ID NO:28 is the amino acid sequence of the Arabidopsis thaliana “unknown protein” (LNT2) (At5g50930; NCBI General Identifier No. 15241317).

SEQ ID NO:29 is the nucleotide sequence of an alternative splice variant (referred to herein as “Int2-2”) of At5g50930.

SEQ ID NO:30 is the amino acid sequence of the polypeptide encoded by Int2-2 (SEQ ID NO:29) and is referred to herein as “LNT2-2”.

SEQ ID NO:31 is the nucleotide sequence of a second alternative splice variant (referred to herein as “Int2-3”) of At5g50930.

SEQ ID NO:32 is the amino acid sequence of the polypeptide encoded by Int2-3 (SEQ ID NO:29) and is referred to herein as “LNT2-3”. SEQ ID NO:32 is 100% identical to SEQ ID NO:52198 in EP1033405 based on the Clustal V method of alignment, using default parameters.

SEQ ID NO:33 is the amino acid sequence of the Oryza sativa “unknown protein” (NCBI General Identifier No. 38347162).

SEQ ID NO:34 is the amino acid sequence of the Vitis vinifera “hypothetical protein” (NCBI General Identifier No. 147791927).

SEQ ID NO:35 is the nucleotide sequence of the At5g50930-5′ attB forward primer.

SEQ ID NO:36 is the nucleotide sequence of the At5g50930-3′ attB reverse primer.

DETAILED DESCRIPTION OF OTHER EMBODIMENTS

The disclosure of each reference set forth herein is hereby incorporated by reference in its entirety.

As used herein and in the appended claims, the singular forms “a”, “an”, and “the” include plural reference unless the context clearly dictates otherwise. Thus, for example, reference to “a plant” includes a plurality of such plants, reference to “a cell” includes one or more cells and equivalents thereof known to those skilled in the art, and so forth.

As used herein:

“Nitrogen limiting conditions” refers to conditions where the amount of total available nitrogen (e.g., from nitrates, ammonia, or other known sources of nitrogen) is not sufficient to sustain optimal plant growth and development. One skilled in the art would recognize conditions where total available nitrogen is sufficient to sustain optimal plant growth and development. One skilled in the art would recognize what constitutes sufficient amounts of total available nitrogen, and what constitutes soils, media and fertilizer inputs for providing nitrogen to plants. Nitrogen limiting conditions will vary depending upon a number of factors, including but not limited to, the particular plant and environmental conditions.

“Agronomic characteristic” is a measurable parameter including but not limited to, greenness, yield, growth rate, biomass, fresh weight at maturation, dry weight at maturation, fruit yield, seed yield, total plant nitrogen content, fruit nitrogen content, seed nitrogen content, nitrogen content in vegetative tissue, whole plant amino acid content, vegetative tissue free amino acid content, fruit free amino acid content, seed free amino acid content, total plant protein content, fruit protein content, seed protein content, protein content in a vegetative tissue, drought tolerance, nitrogen uptake, resistance to root lodging, harvest index, stalk lodging, plant height, ear height, and ear length.

“Harvest index” refers to the grain weight divided by the total plant weight.

“Int2” refers to the Arabidopsis thaliana gene locus, At5g50930 (SEQ ID NO: 27). “LNT2” refers to the protein (SEQ ID NO:28) encoded by SEQ ID NO:27.

“Int2-2” (SEQ ID NO:29) and “Int2-3” (SEQ ID NO:31) are naturally occurring alternative splice variants of the At5g50930 gene. “LNT2-2” (SEQ ID NO:30) and “LNT2-3” (SEQ ID NO:32) refer to the proteins encoded by “Int2-2” and “Int2-3”, respectively.

“Int2-like” refers to nucleotide homologs from different species, such as corn and soybean, of the Arabidopsis thaliana “Int2” locus At5g50930 (SEQ ID NO: 28) and includes without limitation any of the nucleotide sequences of SEQ ID NOs: 17, 19, 23, and 25.

“LNT2-like” refers to protein homologs from different species, such as corn and soybean, of the Arabidopsis thaliana “LNT2” (SEQ ID NO: 28) and includes without limitation any of the amino acid sequences of SEQ ID NOs: 18, 20, 24, and 26.

“Alternative splice variants” used herein refers to alternative forms of RNA transcribed from a gene. Splice variation naturally occurs as a result of alternative sites being spliced within a single transcribed RNA molecule or between separately transcribed RNA molecules, and may result in several different forms of mRNA transcribed from the same gene. Thus, splice variants may encode polypeptides having different amino acid sequences, which may or may not have similar functions in the organism.

“Nitrogen stress tolerance” is a trait of a plant and refers to the ability of the plant to survive under nitrogen limiting conditions.

“Increased nitrogen stress tolerance” of a plant is measured relative to a reference or control plant, and means that the nitrogen stress tolerance of the plant is increased by any amount or measure when compared to the nitrogen stress tolerance of the reference or control plant.

A “nitrogen stress tolerant plant” is a plant that exhibits nitrogen stress tolerance. A nitrogen stress tolerant plant is In an embodiment a plant that exhibits an increase in at least one agronomic characteristic relative to a control plant under nitrogen limiting conditions.

“Environmental conditions” refer to conditions under which the plant is grown, such as the availability of water, availability of nutrients (for example nitrogen), or the presence of insects or disease.

“Transgenic” refers to any cell, cell line, callus, tissue, plant part or plant, the genome of which has been altered by the presence of a heterologous nucleic acid, such as a recombinant DNA construct, including those initial transgenic events as well as those created by sexual crosses or asexual propagation from the initial transgenic event. The term “transgenic” as used herein does not encompass the alteration of the genome (chromosomal or extra-chromosomal) by conventional plant breeding methods or by naturally occurring events such as random cross-fertilization, non-recombinant viral infection, non-recombinant bacterial transformation, non-recombinant transposition, or spontaneous mutation.

“Genome” as it applies to plant cells encompasses not only chromosomal DNA found within the nucleus, but organelle DNA found within subcellular components (e.g., mitochondrial, plastid) of the cell.

“Plant” includes reference to whole plants, plant organs, plant tissues, seeds and plant cells and progeny of same. Plant cells include, without limitation, cells from seeds, suspension cultures, embryos, meristematic regions, callus tissue, leaves, roots, shoots, gametophytes, sporophytes, pollen, and microspores.

“Progeny” comprises any subsequent generation of a plant.

“Transgenic plant” includes reference to a plant which comprises within its genome a heterologous polynucleotide. In an embodiment, the heterologous polynucleotide is stably integrated within the genome such that the polynucleotide is passed on to successive generations. The heterologous polynucleotide may be integrated into the genome alone or as part of a recombinant DNA construct.

“Heterologous” with respect to sequence means a sequence that originates from a foreign species, or, if from the same species, is substantially modified from its native form in composition and/or genomic locus by deliberate human intervention.

“Polynucleotide”, “nucleic acid sequence”, “nucleotide sequence”, or “nucleic acid fragment” are used interchangeably to refer to a polymer of RNA or DNA that is single- or double-stranded, optionally containing synthetic, non-natural or altered nucleotide bases. Nucleotides (usually found in their 5′-monophosphate form) are referred to by their single letter designation as follows: “A” for adenylate or deoxyadenylate (for RNA or DNA, respectively), “C” for cytidylate or deoxycytidylate, “G” for guanylate or deoxyguanylate, “U” for uridylate, “T” for deoxythymidylate, “R” for purines (A or G), “Y” for pyrimidines (C or T), “K” for G or T, “H” for A or C or T, “I” for inosine, and “N” for any nucleotide.

“Polypeptide”, “peptide”, “amino acid sequence” and “protein” are used interchangeably herein to refer to a polymer of amino acid residues. The terms apply to amino acid polymers in which one or more amino acid residue is an artificial chemical analogue of a corresponding naturally occurring amino acid, as well as to naturally occurring amino acid polymers. The terms “polypeptide”, “peptide”, “amino acid sequence”, and “protein” are also inclusive of modifications including, but not limited to, glycosylation, lipid attachment, sulfation, gamma-carboxylation of glutamic acid residues, hydroxylation and ADP-ribosylation.

“Messenger RNA (mRNA)” refers to the RNA that is without introns and that can be translated into protein by the cell.

“cDNA” refers to a DNA that is complementary to and synthesized from an mRNA template using the enzyme reverse transcriptase. The cDNA can be single-stranded or converted into the double-stranded form using the Klenow fragment of DNA polymerase I.

An “Expressed Sequence Tag” (“EST”) is a DNA sequence derived from a cDNA library and therefore is a sequence which has been transcribed. An EST is typically obtained by a single sequencing pass of a cDNA insert. The sequence of an entire cDNA insert is termed the “Full-Insert Sequence” (“FIS”). A “Contig” sequence is a sequence assembled from two or more sequences that can be selected from, but not limited to, the group consisting of an EST, FIS and PCR sequence. A sequence encoding an entire or functional protein is termed a “Complete Gene Sequence” (“CGS”) and can be derived from an FIS or a contig.

“Mature” protein refers to a post-translationally processed polypeptide; i.e., one from which any pre- or pro-peptides present in the primary translation product have been removed.

“Precursor” protein refers to the primary product of translation of mRNA; i.e., with pre- and pro-peptides still present. Pre- and pro-peptides may be and are not limited to intracellular localization signals.

“Isolated” refers to materials, such as nucleic acid molecules and/or proteins, which are substantially free or otherwise removed from components that normally accompany or interact with the materials in a naturally occurring environment. Isolated polynucleotides may be purified from a host cell in which they naturally occur. Conventional nucleic acid purification methods known to skilled artisans may be used to obtain isolated polynucleotides. The term also embraces recombinant polynucleotides and chemically synthesized polynucleotides.

“Recombinant” refers to an artificial combination of two otherwise separated segments of sequence, e.g., by chemical synthesis or by the manipulation of isolated segments of nucleic acids by genetic engineering techniques. “Recombinant” also includes reference to a cell or vector, that has been modified by the introduction of a heterologous nucleic acid or a cell derived from a cell so modified, but does not encompass the alteration of the cell or vector by naturally occurring events (e.g., spontaneous mutation, natural transformation/transduction/transposition) such as those occurring without deliberate human intervention.

“Recombinant DNA construct” refers to a combination of nucleic acid fragments that are not normally found together in nature. Accordingly, a recombinant DNA construct may comprise regulatory sequences and coding sequences that are derived from different sources, or regulatory sequences and coding sequences derived from the same source, but arranged in a manner different than that normally found in nature.

The terms “entry clone” and “entry vector” are used interchangeably herein.

“Regulatory sequences” and “regulatory elements” are used interchangeably and refer to nucleotide sequences located upstream (5′ non-coding sequences), within, or downstream (3′ non-coding sequences) of a coding sequence, and which influence the transcription, RNA processing or stability, or translation of the associated coding sequence. Regulatory sequences may include, but are not limited to, promoters, translation leader sequences, introns, and polyadenylation recognition sequences.

“Promoter” refers to a nucleic acid fragment capable of controlling transcription of another nucleic acid fragment.

“Promoter functional in a plant” is a promoter capable of controlling transcription in plant cells whether or not its origin is from a plant cell.

“Tissue-specific promoter” and “tissue-preferred promoter” are used interchangeably to refer to a promoter that is expressed predominantly but not necessarily exclusively in one tissue or organ, but that may also be expressed in one specific cell.

“Developmentally regulated promoter” refers to a promoter whose activity is determined by developmental events.

“Operably linked” refers to the association of nucleic acid fragments in a single fragment so that the function of one is regulated by the other. For example, a promoter is operably linked with a nucleic acid fragment when it is capable of regulating the transcription of that nucleic acid fragment.

“Expression” refers to the production of a functional product. For example, expression of a nucleic acid fragment may refer to transcription of the nucleic acid fragment (e.g., transcription resulting in mRNA or functional RNA) and/or translation of mRNA into a precursor or mature protein.

“Phenotype” means the detectable characteristics of a cell or organism.

“Introduced” in the context of inserting a nucleic acid fragment (e.g., a recombinant DNA construct) into a cell, means “transfection” or “transformation” or “transduction” and includes reference to the incorporation of a nucleic acid fragment into a eukaryotic or prokaryotic cell where the nucleic acid fragment may be incorporated into the genome of the cell (e.g., chromosome, plasmid, plastid or mitochondrial DNA), converted into an autonomous replicon, or transiently expressed (e.g., transfected mRNA).

A “transformed cell” is any cell into which a nucleic acid fragment (e.g., a recombinant DNA construct) has been introduced.

“Transformation” as used herein refers to both stable transformation and transient transformation.

“Stable transformation” refers to the introduction of a nucleic acid fragment into a genome of a host organism resulting in genetically stable inheritance. Once stably transformed, the nucleic acid fragment is stably integrated in the genome of the host organism and any subsequent generation.

“Transient transformation” refers to the introduction of a nucleic acid fragment into the nucleus, or DNA-containing organelle, of a host organism resulting in gene expression without genetically stable inheritance.

“Allele” is one of several alternative forms of a gene occupying a given locus on a chromosome. When the alleles present at a given locus on a pair of homologous chromosomes in a diploid plant are the same that plant is homozygous at that locus. If the alleles present at a given locus on a pair of homologous chromosomes in a diploid plant differ that plant is heterozygous at that locus. If a transgene is present on one of a pair of homologous chromosomes in a diploid plant that plant is hemizygous at that locus.

Sequence alignments and percent identity calculations may be determined using a variety of comparison methods designed to detect homologous sequences including, but not limited to, the MEGALIGN® program of the LASERGENE® bioinformatics computing suite (DNASTAR® Inc., Madison, Wis.). Unless stated otherwise, multiple alignment of the sequences provided herein were performed using the Clustal V method of alignment (Higgins and Sharp, CABIOS. 5:151-153 (1989)) with the default parameters (GAP PENALTY=10, GAP LENGTH PENALTY=10). Default parameters for pairwise alignments and calculation of percent identity of protein sequences using the Clustal V method are KTUPLE=1, GAP PENALTY=3, WINDOW=5 and DIAGONALS SAVED=5. For nucleic acids these parameters are KTUPLE=2, GAP PENALTY=5, WINDOW=4 and DIAGONALS SAVED=4. After alignment of the sequences, using the Clustal V program, it is possible to obtain “percent identity” and “divergence” values by viewing the “sequence distances” table on the same program; unless stated otherwise, percent identities and divergences provided and claimed herein were calculated in this manner.

Standard recombinant DNA and molecular cloning techniques used herein are well known in the art and are described more fully in Sambrook, J., Fritsch, E. F. and Maniatis, T. Molecular Cloning: A Laboratory Manual; Cold Spring Harbor Laboratory Press: Cold Spring Harbor, 1989 (hereinafter “Sambrook”).

Turning now to several embodiments:

Other embodiments include isolated polynucleotides and polypeptides, recombinant DNA constructs, compositions (such as plants or seeds) comprising these recombinant DNA constructs, and methods utilizing these recombinant DNA constructs.

Other Isolated Polynucleotides and Polypeptides

The present invention includes the following other isolated polynucleotides and polypeptides:

An isolated polynucleotide comprising: (i) a nucleic acid sequence encoding a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; or (ii) a full complement of the nucleic acid sequence of (i), wherein the full complement and the nucleic acid sequence of (i) consist of the same number of nucleotides and are 100% complementary. Any of the foregoing isolated polynucleotides may be utilized in any recombinant DNA constructs (including suppression DNA constructs) of the present invention. The polypeptide can be an LNT2 or LNT2-like protein.

An isolated polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32. The polypeptide is can be an LNT2 or LNT2-like protein.

An isolated polynucleotide comprising (i) a nucleic acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:17, 19, 23, 25, 27, 29, or 31; or (ii) a full complement of the nucleic acid sequence of (i). Any of the foregoing isolated polynucleotides may be utilized in any recombinant DNA constructs (including suppression DNA constructs) of the present invention. The isolated polynucleotide can be encodes an LNT2 or LNT2-like protein.

Other Recombinant DNA Constructs and Suppression DNA Constructs

In one aspect, the present invention includes recombinant DNA constructs (including suppression DNA constructs).

In one other embodiment, a recombinant DNA construct comprises a polynucleotide operably linked to at least one regulatory sequence (e.g., a promoter functional in a plant), wherein the polynucleotide comprises (i) a nucleic acid sequence encoding an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; or (ii) a full complement of the nucleic acid sequence of (i).

In another other embodiment, a recombinant DNA construct comprises a polynucleotide operably linked to at least one regulatory sequence (e.g., a promoter functional in a plant), wherein said polynucleotide comprises (i) a nucleic acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:17, 19, 23, 25, 27, 29, or 31; or (ii) a full complement of the nucleic acid sequence of (i).

FIGS. 14A and 14B show the multiple alignment of the amino acid sequences of SEQ ID NOs: 18, 20, 24, 26, 28, 30, 32, 33, and 34 The multiple alignment of the sequences was performed using the MEGALIGN® program of the LASERGENE® bioinformatics computing suite (DNASTAR® Inc., Madison, Wis.); in particular, using the Clustal V method of alignment (Higgins and Sharp, CABIOS. 5:151-153 (1989)) with the multiple alignment default parameters of GAP PENALTY=10 and GAP LENGTH PENALTY=10, and the pairwise alignment default parameters of KTUPLE=1, GAP PENALTY=3, WINDOW=5 and DIAGONALS SAVED=5.

FIG. 15 is a chart of the percent sequence identity and the divergence values for each pair of amino acids sequences displayed in FIGS. 14A and 14B.

In another other embodiment, a recombinant DNA construct comprises a polynucleotide operably linked to at least one regulatory sequence (e.g., a promoter functional in a plant), wherein said polynucleotide encodes an LNT2 or LNT2-like protein.

In another aspect, the present invention includes suppression DNA constructs.

A suppression DNA construct can comprise at least one regulatory sequence (in an embodiment a promoter functional in a plant) operably linked to (a) all or part of: (i) a nucleic acid sequence encoding a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; or (ii) a full complement of the nucleic acid sequence of (a)(i); or (b) a region derived from all or part of a sense strand or antisense strand of a target gene of interest, said region having a nucleic acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to said all or part of a sense strand or antisense strand from which said region is derived, and wherein said target gene of interest encodes an LNT2 or LNT2-like protein; or (c) all or part of: (i) a nucleic acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:17, 19, 23, 25, 27, 29, or 31; or (ii) a full complement of the nucleic acid sequence of (c)(i). The suppression DNA construct in an embodiment, comprises a cosuppression construct, antisense construct, viral-suppression construct, hairpin suppression construct, stem-loop suppression construct, double-stranded RNA-producing construct, RNAi construct, or small RNA construct (e.g., an siRNA construct or an miRNA construct).

It is understood, as those skilled in the art will appreciate, that the invention encompasses more than the specific exemplary sequences. Alterations in a nucleic acid fragment which result in the production of a chemically equivalent amino acid at a given site, but do not affect the functional properties of the encoded polypeptide, are well known in the art. For example, a codon for the amino acid alanine, a hydrophobic amino acid, may be substituted by a codon encoding another less hydrophobic residue, such as glycine, or a more hydrophobic residue, such as valine, leucine, or isoleucine. Similarly, changes which result in substitution of one negatively charged residue for another, such as aspartic acid for glutamic acid, or one positively charged residue for another, such as lysine for arginine, can also be expected to produce a functionally equivalent product. Nucleotide changes which result in alteration of the N-terminal and C-terminal portions of the polypeptide molecule would also not be expected to alter the activity of the polypeptide. Each of the proposed modifications is well within the routine skill in the art, as is determination of retention of biological activity of the encoded products.

“Suppression DNA construct” is a recombinant DNA construct which when transformed or stably integrated into the genome of the plant, results in “silencing” of a target gene in the plant. The target gene may be endogenous or transgenic to the plant. “Silencing,” as used herein with respect to the target gene, refers generally to the suppression of levels of mRNA or protein/enzyme expressed by the target gene, and/or the level of the enzyme activity or protein functionality. The terms “suppression”, “suppressing” and “silencing”, used interchangeably herein, includes lowering, reducing, declining, decreasing, inhibiting, eliminating or preventing. “Silencing” or “gene silencing” does not specify mechanism and is inclusive, and not limited to, anti-sense, cosuppression, viral-suppression, hairpin suppression, stem-loop suppression, RNAi-based approaches, and small RNA-based approaches.

A suppression DNA construct may comprise a region derived from a target gene of interest and may comprise all or part of the nucleic acid sequence of the sense strand (or antisense strand) of the target gene of interest. Depending upon the approach to be utilized, the region may be 100% identical or less than 100% identical (e.g., at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identical) to all or part of the sense strand (or antisense strand) of the gene of interest.

Suppression DNA constructs are well-known in the art, are readily constructed once the target gene of interest is selected, and include, without limitation, cosuppression constructs, antisense constructs, viral-suppression constructs, hairpin suppression constructs, stem-loop suppression constructs, double-stranded RNA-producing constructs, and more generally, RNAi (RNA interference) constructs and small RNA constructs such as siRNA (short interfering RNA) constructs and miRNA (microRNA) constructs.

“Antisense inhibition” refers to the production of antisense RNA transcripts capable of suppressing the expression of the target gene or gene product. “Antisense RNA” refers to an RNA transcript that is complementary to all or part of a target primary transcript or mRNA and that blocks the expression of a target isolated nucleic acid fragment (U.S. Pat. No. 5,107,065). The complementarity of an antisense RNA may be with any part of the specific gene transcript, i.e., at the 5′ non-coding sequence, 3′ non-coding sequence, introns, or the coding sequence.

“Cosuppression” refers to the production of sense RNA transcripts capable of suppressing the expression of the target gene or gene product. “Sense” RNA refers to RNA transcript that includes the mRNA and can be translated into protein within a cell or in vitro. Cosuppression constructs in plants have been previously designed by focusing on overexpression of a nucleic acid sequence having homology to a native mRNA, in the sense orientation, which results in the reduction of all RNA having homology to the overexpressed sequence (see Vaucheret et al., Plant J. 16:651-659 (1998); and Gura, Nature 404:804-808 (2000)).

Another variation describes the use of plant viral sequences to direct the suppression of proximal mRNA encoding sequences (PCT Publication No. WO 98/36083 published on Aug. 20, 1998).

Previously described is the use of “hairpin” structures that incorporate all, or part, of an mRNA encoding sequence in a complementary orientation that results in a potential “stem-loop” structure for the expressed RNA (PCT Publication No. WO 99/53050 published on Oct. 21, 1999). In this case the stem is formed by polynucleotides corresponding to the gene of interest inserted in either sense or anti-sense orientation with respect to the promoter and the loop is formed by some polynucleotides of the gene of interest, which do not have a complement in the construct. This increases the frequency of cosuppression or silencing in the recovered transgenic plants. For a review of hairpin suppression see Wesley, S. V. et al. (2003) Methods in Molecular Biology, Plant Functional Genomics: Methods and Protocols 236:273-286.

A construct where the stem is formed by at least 30 nucleotides from a gene to be suppressed and the loop is formed by a random nucleotide sequence has also effectively been used for suppression (PCT Publication No. WO 99/61632 published on Dec. 2, 1999).

The use of poly-T and poly-A sequences to generate the stem in the stem-loop structure has also been described (PCT Publication No. WO 02/00894 published Jan. 3, 2002).

Yet another variation includes using synthetic repeats to promote formation of a stem in the stem-loop structure. Transgenic organisms prepared with such recombinant DNA fragments have been shown to have reduced levels of the protein encoded by the nucleotide fragment forming the loop as described in PCT Publication No. WO 02/00904, published Jan. 3, 2002.

RNA interference refers to the process of sequence-specific post-transcriptional gene silencing in animals mediated by short interfering RNAs (siRNAs) (Fire et al., Nature 391:806 (1998)). The corresponding process in plants is commonly referred to as post-transcriptional gene silencing (PTGS) or RNA silencing and is also referred to as quelling in fungi. The process of post-transcriptional gene silencing is thought to be an evolutionarily-conserved cellular defense mechanism used to prevent the expression of foreign genes and is commonly shared by diverse flora and phyla (Fire et al., Trends Genet. 15:358 (1999)). Such protection from foreign gene expression may have evolved in response to the production of double-stranded RNAs (dsRNAs) derived from viral infection or from the random integration of transposon elements into a host genome via a cellular response that specifically destroys homologous single-stranded RNA of viral genomic RNA. The presence of dsRNA in cells triggers the RNAi response through a mechanism that has yet to be fully characterized.

The presence of long dsRNAs in cells stimulates the activity of a ribonuclease III enzyme referred to as dicer. Dicer is involved in the processing of the dsRNA into short pieces of dsRNA known as short interfering RNAs (siRNAs) (Berstein et al., Nature 409:363 (2001)). Short interfering RNAs derived from dicer activity are typically about 21 to about 23 nucleotides in length and comprise about 19 base pair duplexes (Elbashir et al., Genes Dev. 15:188 (2001)). Dicer has also been implicated in the excision of 21- and 22-nucleotide small temporal RNAs (stRNAs) from precursor RNA of conserved structure that are implicated in translational control (Hutvagner et al., Science 293:834 (2001)). The RNAi response also features an endonuclease complex, commonly referred to as an RNA-induced silencing complex (RISC), which mediates cleavage of single-stranded RNA having sequence complementarity to the antisense strand of the siRNA duplex. Cleavage of the target RNA takes place in the middle of the region complementary to the antisense strand of the siRNA duplex. In addition, RNA interference can also involve small RNA (e.g., miRNA) mediated gene silencing, presumably through cellular mechanisms that regulate chromatin structure and thereby prevent transcription of target gene sequences (see, e.g., Allshire, Science 297:1818-1819 (2002); Volpe et al., Science 297:1833-1837 (2002); Jenuwein, Science 297:2215-2218 (2002); and Hall et al., Science 297:2232-2237 (2002)). As such, miRNA molecules of the invention can be used to mediate gene silencing via interaction with RNA transcripts or alternately by interaction with particular gene sequences, wherein such interaction results in gene silencing either at the transcriptional or post-transcriptional level.

RNAi has been studied in a variety of systems. Fire et al. (Nature 391:806 (1998)) were the first to observe RNAi in Caenorhabditis elegans. Wianny and Goetz (Nature Cell Biol. 2:70 (1999)) describe RNAi mediated by dsRNA in mouse embryos. Hammond et al. (Nature 404:293 (2000)) describe RNAi in Drosophila cells transfected with dsRNA. Elbashir et al., (Nature 411:494 (2001)) describe RNAi induced by introduction of duplexes of synthetic 21-nucleotide RNAs in cultured mammalian cells including human embryonic kidney and HeLa cells.

Small RNAs play an important role in controlling gene expression. Regulation of many developmental processes, including flowering, is controlled by small RNAs. It is now possible to engineer changes in gene expression of plant genes by using transgenic constructs which produce small RNAs in the plant.

Small RNAs appear to function by base-pairing to complementary RNA or DNA target sequences. When bound to RNA, small RNAs trigger either RNA cleavage or translational inhibition of the target sequence. When bound to DNA target sequences, it is thought that small RNAs can mediate DNA methylation of the target sequence. The consequence of these events, regardless of the specific mechanism, is that gene expression is inhibited.

It is thought that sequence complementarity between small RNAs and their RNA targets helps to determine which mechanism, RNA cleavage or translational inhibition, is employed. It is believed that siRNAs which are perfectly complementary with their targets, work by RNA cleavage. Some miRNAs have perfect or near-perfect complementarity with their targets, and RNA cleavage has been demonstrated for at least a few of these miRNAs. Other miRNAs have several mismatches with their targets, and apparently inhibit their targets at the translational level. Again, without being held to a particular theory on the mechanism of action, a general rule is emerging that perfect or near-perfect complementarity causes RNA cleavage, whereas translational inhibition is favored when the miRNA/target duplex contains many mismatches. The apparent exception to this is microRNA 172 (miR172) in plants. One of the targets of miR172 is APETALA2 (AP2), and although miR172 shares near-perfect complementarity with AP2 it appears to cause translational inhibition of AP2 rather than RNA cleavage.

MicroRNAs (miRNAs) are noncoding RNAs of about 19 to about 24 nucleotides (nt) in length that have been identified in both animals and plants (Lagos-Quintana et al., Science 294:853-858 (2001), Lagos-Quintana et al., Curr. Biol. 12:735-739 (2002); Lau et al., Science 294:858-862 (2001); Lee and Ambros, Science 294:862-864 (2001); Llave et al., Plant Cell 14:1605-1619 (2002); Mourelatos et al., Genes. Dev. 16:720-728 (2002); Park et al., Curr. Biol. 12:1484-1495 (2002); Reinhart et al., Genes. Dev. 16:1616-1626 (2002)). They are processed from longer precursor transcripts that range in size from approximately 70 to 200 nt, and these precursor transcripts have the ability to form stable hairpin structures. In animals, the enzyme involved in processing miRNA precursors is called dicer, an RNAse III-like protein (Grishok et al., Cell 106:23-34 (2001); Hutvagner et al., Science 293:834-838 (2001); Ketting et al., Genes. Dev. 15:2654-2659 (2001)). Plants also have a dicer-like enzyme, DCL1 (previously named CARPEL FACTORY/SHORT INTEGUMENTS1/SUSPENSOR1), and recent evidence indicates that it, like dicer, is involved in processing the hairpin precursors to generate mature miRNAs (Park et al., Curr. Biol. 12:1484-1495 (2002); Reinhart et al., Genes Dev. 16:1616-1626 (2002)). Furthermore, it is becoming clear from recent work that at least some miRNA hairpin precursors originate as longer polyadenylated transcripts, and several different miRNAs and associated hairpins can be present in a single transcript (Lagos-Quintana et al., Science 294:853-858 (2001); Lee et al., EMBO J. 21:4663-4670 (2002)). Recent work has also examined the selection of the miRNA strand from the dsRNA product arising from processing of the hairpin by DICER (Schwartz et al., Cell 115:199-208 (2003)). It appears that the stability (i.e., G:C versus A:U content, and/or mismatches) of the two ends of the processed dsRNA affects the strand selection, with the low stability end being easier to unwind by a helicase activity. The 5′ end strand at the low stability end is incorporated into the RISC complex, while the other strand is degraded.

MicroRNAs (miRNAs) appear to regulate target genes by binding to complementary sequences located in the transcripts produced by these genes. In the case of lin-4 and let-7, the target sites are located in the 3′ UTRs of the target mRNAs (Lee et al., Cell 75:843-854 (1993); Wightman et al., Cell 75:855-862 (1993); Reinhart et al., Nature 403:901-906 (2000); Slack et al., Mol. Cell. 5:659-669 (2000)), and there are several mismatches between the lin-4 and let-7 miRNAs and their target sites. Binding of the lin-4 or let-7 miRNA appears to cause downregulation of steady-state levels of the protein encoded by the target mRNA without affecting the transcript itself (Olsen and Ambros, Dev. Biol. 216:671-680 (1999)). On the other hand, recent evidence suggests that miRNAs can in some cases cause specific RNA cleavage of the target transcript within the target site, and this cleavage step appears to require 100% complementarity between the miRNA and the target transcript (Hutvagner and Zamore, Science 297:2056-2060 (2002); Llave et al., Plant Cell 14:1605-1619 (2002)). It seems likely that miRNAs can enter at least two pathways of target gene regulation: (1) protein downregulation when target complementarity is <100%; and (2) RNA cleavage when target complementarity is 100%. MicroRNAs entering the RNA cleavage pathway are analogous to the 21-25 nt short interfering RNAs (siRNAs) generated during RNA interference (RNAi) in animals and posttranscriptional gene silencing (PTGS) in plants, and likely are incorporated into an RNA-induced silencing complex (RISC) that is similar or identical to that seen for RNAi.

Identifying the targets of miRNAs with bioinformatics has not been successful in animals, and this is probably due to the fact that animal miRNAs have a low degree of complementarity with their targets. On the other hand, bioinformatic approaches have been successfully used to predict targets for plant miRNAs (Llave et al., Plant Cell 14:1605-1619 (2002); Park et al., Curr. Biol. 12:1484-1495 (2002); Rhoades et al., Cell 110:513-520 (2002)), and thus it appears that plant miRNAs have higher overall complementarity with their putative targets than do animal miRNAs. Most of these predicted target transcripts of plant miRNAs encode members of transcription factor families implicated in plant developmental patterning or cell differentiation.

Regulatory Sequences:

A recombinant DNA construct (including a suppression DNA construct) of the present invention can comprise at least one regulatory sequence.

A regulatory sequence is a promoter.

A number of promoters can be used in recombinant DNA constructs (and suppression DNA constructs) of the present invention. The promoters can be selected based on the desired outcome, and may include constitutive, tissue-specific, inducible, or other promoters for expression in the host organism.

High level, constitutive expression of the candidate gene under control of the 35S or UBI promoter may (or may not) have pleiotropic effects, although candidate gene efficacy may be estimated when driven by a constitutive promoter. Use of tissue-specific and/or stress-specific promoters may eliminate undesirable effects, but retain the ability to enhance nitrogen tolerance. This type of effect has been observed in Arabidopsis for drought and cold tolerance (Kasuga et al., Nature Biotechnol. 17:287-91 (1999)).

Suitable constitutive promoters for use in a plant host cell include, for example, the core promoter of the Rsyn7 promoter and other constitutive promoters disclosed in WO 99/43838 and U.S. Pat. No. 6,072,050; the core CaMV 35S promoter (Odell et al., Nature 313:810-812 (1985)); rice actin (McElroy et al., Plant Cell 2:163-171 (1990)); ubiquitin (Christensen et al., Plant Mol. Biol. 12:619-632 (1989) and Christensen et al., Plant Mol. Biol. 18:675-689 (1992)); pEMU (Last et al., Theor. Appl. Genet. 81:581-588 (1991)); MAS (Velten et al., EMBO J. 3:2723-2730 (1984)); ALS promoter (U.S. Pat. No. 5,659,026), and the like. Other constitutive promoters include, for example, those discussed in U.S. Pat. Nos. 5,608,149; 5,608,144; 5,604,121; 5,569,597; 5,466,785; 5,399,680; 5,268,463; 5,608,142; and 6,177,611.

In choosing a promoter to use in the methods of the invention, it may be desirable to use a tissue-specific or developmentally regulated promoter.

Another tissue-specific or developmentally regulated promoter is a DNA sequence which regulates the expression of a DNA sequence selectively in the cells/tissues of a plant critical to tassel development, seed set, or both, and limits the expression of such a DNA sequence to the period of tassel development or seed maturation in the plant. Any identifiable promoter may be used in the methods of the present invention which causes the desired temporal and spatial expression.

Promoters which are seed or embryo-specific and may be useful in the invention include soybean Kunitz trypsin inhibitor (Kti3, Jofuku and Goldberg, Plant Cell 1:1079-1093 (1989)), patatin (potato tubers) (Rocha-Sosa, M., et al., EMBO J. 8:23-29 (1989)), convicilin, vicilin, and legumin (pea cotyledons) (Rerie, W. G., et al., Mol. Gen. Genet. 259:149-157 (1991); Newbigin, E. J., et al., Planta 180:461-470 (1990); Higgins, T. J. V., et al., Plant. Mol. Biol. 11:683-695 (1988)), zein (maize endosperm) (Schemthaner, J. P., et al., EMBO J. 7:1249-1255 (1988)), phaseolin (bean cotyledon) (Segupta-Gopalan, C., et al., Proc. Natl. Acad. Sci. U.S.A. 82:3320-3324 (1995)), phytohemagglutinin (bean cotyledon) (Voelker, T. et al., EMBO J. 6:3571-3577 (1987)), B-conglycinin and glycinin (soybean cotyledon) (Chen, Z-L, et al., EMBO J. 7:297-302 (1988)), glutelin (rice endosperm), hordein (barley endosperm) (Marris, C., et al., Plant Mol. Biol. 10:359-366 (1988)), glutenin and gliadin (wheat endosperm) (Colot, V., et al., EMBO J. 6:3559-3564 (1987)), and sporamin (sweet potato tuberous root) (Hattori, T., et al., Plant Mol. Biol. 14:595-604 (1990)). Promoters of seed-specific genes operably linked to heterologous coding regions in chimeric gene constructions maintain their temporal and spatial expression pattern in transgenic plants. Such examples include Arabidopsis thaliana 2S seed storage protein gene promoter to express enkephalin peptides in Arabidopsis and Brassica napus seeds (Vanderkerckhove et al., Bio/Technology 7:L929-932 (1989)), bean lectin and bean beta-phaseolin promoters to express luciferase (Riggs et al., Plant Sci. 63:47-57 (1989)), and wheat glutenin promoters to express chloramphenicol acetyl transferase (Colot et al., EMBO J. 6:3559-3564 (1987)).

Inducible promoters selectively express an operably linked DNA sequence in response to the presence of an endogenous or exogenous stimulus, for example by chemical compounds (chemical inducers) or in response to environmental, hormonal, chemical, and/or developmental signals. Inducible or regulated promoters include, for example, promoters regulated by light, heat, stress, flooding or drought, phytohormones, wounding, or chemicals such as ethanol, jasmonate, salicylic acid, or safeners.

Other promoters include the following: 1) the stress-inducible RD29A promoter (Kasuga et al., Nature Biotechnol. 17:287-91 (1999)); 2) the barley promoter, B22E; expression of B22E is specific to the pedicel in developing maize kernels (“Primary Structure of a Novel Barley Gene Differentially Expressed in Immature Aleurone Layers”, Klemsdal et al., Mol. Gen. Genet. 228(1/2):9-16 (1991)); and 3) maize promoter, Zag2 (“Identification and molecular characterization of ZAG1, the maize homolog of the Arabidopsis floral homeotic gene AGAMOUS”, Schmidt et al., Plant Cell 5(7):729-737 (1993); “Structural characterization, chromosomal localization and phylogenetic evaluation of two pairs of AGAMOUS-like MADS-box genes from maize”, Theissen et al., Gene 156(2):155-166 (1995); NCBI GenBank Accession No. X80206)). Zag2 transcripts can be detected five days prior to pollination to seven to eight days after pollination (“DAP”), and directs expression in the carpel of developing female inflorescences and Ciml which is specific to the nucleus of developing maize kernels. Ciml transcript is detected four to five days before pollination to six to eight DAP. Other useful promoters include any promoter which can be derived from a gene whose expression is maternally associated with developing female florets.

Additional other promoters for regulating the expression of the nucleotide sequences of the present invention in plants are stalk-specific promoters. Such stalk-specific promoters include the alfalfa S2A promoter (GenBank Accession No. EF030816; Abrahams et al., Plant Mol. Biol. 27:513-528 (1995)) and S2B promoter (GenBank Accession No. EF030817) and the like, herein incorporated by reference.

Promoters may be derived in their entirety from a native gene, or be composed of different elements derived from different promoters found in nature, or even comprise synthetic DNA segments. It is understood by those skilled in the art that different promoters may direct the expression of a gene in different tissues or cell types, or at different stages of development, or in response to different environmental conditions. It is further recognized that since in most cases the exact boundaries of regulatory sequences have not been completely defined, DNA fragments of some variation may have identical promoter activity. Promoters that cause a gene to be expressed in most cell types at most times are commonly referred to as “constitutive promoters”. New promoters of various types useful in plant cells are constantly being discovered; numerous examples may be found in the compilation by Okamuro, J. K., and Goldberg, R. B., Biochem. Plants 15:1-82 (1989).

Other promoters may include: RIP2, mLIP15, ZmCOR1, Rab17, CaMV 35S, RD29A, B22E, Zag2, SAM synthetase, ubiquitin, CaMV 19S, nos, Adh, sucrose synthase, R-allele, the vascular tissue other promoters S2A (Genbank accession number EF030816) and S2B (GenBank Accession No. EF030817), and the constitutive promoter GOS2 from Zea mays. Other promoters include root promoters, such as the maize NAS2 promoter, the maize Cyclo promoter (US Publication No. 2006/0156439, published Jul. 13, 2006), the maize ROOTMET2 promoter (WO 2005/063998, published Jul. 14, 2005), the CR1BIO promoter (WO 2006/055487, published May 26, 2006), the CRWAQ81 (WO 2005/035770, published Apr. 21, 2005) and the maize ZRP2.47 promoter (NCBI Accession No. U38790; NCBI GI No. 1063664).

Recombinant DNA constructs (and suppression DNA constructs) of the present invention may also include other regulatory sequences including, but not limited to, translation leader sequences, introns, and polyadenylation recognition sequences. In another other embodiment of the present invention, a recombinant DNA construct of the present invention further comprises an enhancer or silencer.

An intron sequence can be added to the 5′ untranslated region, the protein-coding region or the 3′ untranslated region to increase the amount of the mature message that accumulates in the cytosol. Inclusion of a spliceable intron in the transcription unit in both plant and animal expression constructs has been shown to increase gene expression at both the mRNA and protein levels up to 1000-fold (Buchman and Berg, Mol. Cell. Biol. 8:4395-4405 (1988); Callis et al., Genes Dev. 1:1183-1200 (1987)). Such intron enhancement of gene expression is typically greatest when placed near the 5′ end of the transcription unit. Use of maize introns Adh1-S intron 1, 2, and 6, the Bronze-1 intron are known in the art. See generally, The Maize Handbook, Chapter 116, Freeling and Walbot, Eds., Springer, New York (1994).

If polypeptide expression is desired, it is generally desirable to include a polyadenylation region at the 3′-end of a polynucleotide coding region. The polyadenylation region can be derived from the natural gene, from a variety of other plant genes, or from T-DNA. The 3′-end sequence to be added can be derived from, for example, the nopaline synthase or octopine synthase genes, or alternatively from another plant gene, or less in an embodiment from any other eukaryotic gene.

A translation leader sequence is a DNA sequence located between the promoter sequence of a gene and the coding sequence. The translation leader sequence is present in the fully processed mRNA upstream of the translation start sequence. The translation leader sequence may affect processing of the primary transcript to mRNA, mRNA stability or translation efficiency. Examples of translation leader sequences have been described (Turner, R. and Foster, G. D., Mol. Biotech. 3:225 (1995)).

Any plant can be selected for the identification of regulatory sequences and genes to be used in recombinant DNA constructs of the present invention. Examples of suitable plant targets for the isolation of genes and regulatory sequences would include but are not limited to alfalfa, apple, apricot, Arabidopsis, artichoke, arugula, asparagus, avocado, banana, barley, beans, beet, blackberry, blueberry, broccoli, brussels sprouts, cabbage, canola, cantaloupe, carrot, cassaya, castorbean, cauliflower, celery, cherry, chicory, cilantro, citrus, clementines, clover, coconut, coffee, corn, cotton, cranberry, cucumber, Douglas fir, eggplant, endive, escarole, eucalyptus, fennel, figs, garlic, gourd, grape, grapefruit, honey dew, jicama, kiwifruit, lettuce, leeks, lemon, lime, Loblolly pine, linseed, maize, mango, melon, mushroom, nectarine, nut, oat, oil palm, oil seed rape, okra, olive, onion, orange, an ornamental plant, palm, papaya, parsley, parsnip, pea, peach, peanut, pear, pepper, persimmon, pine, pineapple, plantain, plum, pomegranate, poplar, potato, pumpkin, quince, radiata pine, radicchio, radish, rapeseed, raspberry, rice, rye, sorghum, Southern pine, soybean, spinach, squash, strawberry, sugarbeet, sugarcane, sunflower, sweet potato, sweetgum, tangerine, tea, tobacco, tomato, triticale, turf, turnip, a vine, watermelon, wheat, yams, and zucchini. Particularly other plants for the identification of regulatory sequences are Arabidopsis, maize, wheat, soybean, and cotton.

Other Compositions

A other composition of the present invention is a plant comprising in its genome any of the recombinant DNA constructs (including any of the suppression DNA constructs) of the present invention (such as any of the other constructs discussed above). Other compositions also include any progeny of the plant, and any seed obtained from the plant or its progeny, wherein the progeny or seed comprises within its genome the recombinant DNA construct (or suppression DNA construct). Progeny includes subsequent generations obtained by self-pollination or out-crossing of a plant. Progeny also includes hybrids and inbreds.

In an embodiment, in hybrid seed propagated crops, mature transgenic plants can be self-pollinated to produce a homozygous inbred plant. The inbred plant produces seed containing the newly introduced recombinant DNA construct (or suppression DNA construct). These seeds can be grown to produce plants that would exhibit an altered agronomic characteristic (e.g., an increased agronomic characteristic, e.g. under nitrogen limiting conditions), or used in a breeding program to produce hybrid seed, which can be grown to produce plants that would exhibit such an altered agronomic characteristic. In an embodiment, the seeds are maize.

In an embodiment, the plant is a monocotyledonous or dicotyledonous plant, a maize or soybean plant, a maize plant, such as a maize hybrid plant or a maize inbred plant. The plant may also be sunflower, sorghum, canola, wheat, alfalfa, cotton, rice, barley or millet.

In an embodiment, the recombinant DNA construct is stably integrated into the genome of the plant.

Particularly other embodiments include but are not limited to the following other embodiments 1-8:

1. A plant (in an embodiment a maize or soybean plant) comprising in its genome a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence, wherein said polynucleotide encodes a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32, and wherein said plant exhibits increased nitrogen stress tolerance when compared to a control plant not comprising said recombinant DNA construct. In an embodiment, the plant further exhibits an alteration of at least one agronomic characteristic when compared to the control plant.

2. A plant (in an embodiment a maize or soybean plant) comprising in its genome a recombinant DNA construct comprising:

(a) a polynucleotide operably linked to at least one regulatory element, wherein said polynucleotide encodes a polypeptide having an amino acid sequence of at least 50% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; or

(b) a suppression DNA construct comprising at least one regulatory element operably linked to:

-   -   (i) all or part of: (A) a nucleic acid sequence encoding a         polypeptide having an amino acid sequence of at least 50%         sequence identity, based on the Clustal V method of alignment,         when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32, or (B)         a full complement of the nucleic acid sequence of (b)(i)(A); or     -   (ii) a region derived from all or part of a sense strand or         antisense strand of a target gene of interest, said region         having a nucleic acid sequence of at least 50% sequence         identity, based on the Clustal V method of alignment, when         compared to said all or part of a sense strand or antisense         strand from which said region is derived, and wherein said         target gene of interest encodes an LNT2 or LNT2-like         polypeptide,

and wherein said plant exhibits an alteration of at least one agronomic characteristic when compared to a control plant not comprising said recombinant DNA construct.

3. A plant (in an embodiment a maize or soybean plant) comprising in its genome a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence, wherein said polynucleotide encodes an LNT2 or LNT2-like polypeptide, and wherein said plant exhibits increased nitrogen stress tolerance when compared to a control plant not comprising said recombinant DNA construct. In an embodiment, the plant further exhibits an alteration of at least one agronomic characteristic when compared to the control plant. In an embodiment, the LNT2 polypeptide is from Arabidopsis thaliana, Zea mays, Glycine max, Glycine tabacina, Glycine soja or Glycine tomentella.

4. A plant (in an embodiment a maize or soybean plant) comprising in its genome a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence, wherein said polynucleotide encodes an LNT2 or LNT2-like polypeptide, and wherein said plant exhibits an alteration of at least one agronomic characteristic under nitrogen limiting conditions when compared to a control plant not comprising said recombinant DNA construct. In an embodiment, the LNT2 polypeptide is from Arabidopsis thaliana, Zea mays, Glycine max, Glycine tabacina, Glycine soja or Glycine tomentella.

5. A plant (in an embodiment a maize or soybean plant) comprising in its genome a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory element, wherein said polynucleotide encodes a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32, and wherein said plant exhibits an alteration of at least one agronomic characteristic under nitrogen limiting conditions when compared to a control plant not comprising said recombinant DNA construct.

6. A plant (in an embodiment a maize or soybean plant) comprising in its genome a suppression DNA construct comprising at least one regulatory element operably linked to a region derived from all or part of a sense strand or antisense strand of a target gene of interest, said region having a nucleic acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to said all or part of a sense strand or antisense strand from which said region is derived, and wherein said target gene of interest encodes an LNT2 or LNT2-like polypeptide, and wherein said plant exhibits an alteration of at least one agronomic characteristic under nitrogen limiting conditions when compared to a control plant not comprising said suppression DNA construct.

7. A plant (in an embodiment a maize or soybean plant) comprising in its genome a suppression DNA construct comprising at least one regulatory element operably linked to all or part of: (a) a nucleic acid sequence encoding a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; or (b) a full complement of the nucleic acid sequence of (a), and wherein said plant exhibits an alteration of at least one agronomic characteristic under nitrogen limiting conditions when compared to a control plant not comprising said suppression DNA construct.

8. Any progeny of the above plants in other embodiments 1-7, any seeds of the above plants in other embodiments 1-7, any seeds of progeny of the above plants in other embodiments 1-7, and cells from any of the above plants in other embodiments 1-7 and progeny thereof.

In any of the foregoing other embodiments 1-8 or any other embodiments of the present invention, the recombinant DNA construct (or suppression DNA construct) In an embodiment comprises at least a promoter functional in a plant as a other regulatory sequence.

In any of the foregoing other embodiments 1-8 or any other embodiments of the present invention, the alteration of at least one agronomic characteristic is either an increase or decrease, In an embodiment an increase.

In any of the foregoing other embodiments 1-8 or any other embodiments of the present invention, the at least one agronomic characteristic selected from the group consisting of greenness, yield, growth rate, biomass, fresh weight at maturation, dry weight at maturation, fruit yield, seed yield, total plant nitrogen content, fruit nitrogen content, seed nitrogen content, nitrogen content in a vegetative tissue, whole plant amino acid content, vegetative tissue free amino acid content, fruit free amino acid content, seed free amino acid content, total plant protein content, fruit protein content, seed protein content, protein content in a vegetative tissue, drought tolerance, nitrogen uptake, resistance to root lodging, harvest index, stalk lodging, plant height, ear height, and ear length. Yield, greenness and biomass are particularly other agronomic characteristics for alteration (In an embodiment an increase).

In any of the foregoing other embodiments 1-8 or any other embodiments of the present invention, the plant In an embodiment exhibits the alteration of at least one agronomic characteristic when compared, under nitrogen stress conditions, to a control plant not comprising said recombinant DNA construct (or suppression DNA construct).

One of ordinary skill in the art is familiar with protocols for simulating nitrogen conditions, whether limiting or non-limiting, and for evaluating plants that have been subjected to simulated or naturally-occurring nitrogen conditions, whether limiting or non-limiting. For example, one can simulate nitrogen conditions by giving plants less nitrogen than normally required or no nitrogen over a period of time, and one can evaluate such plants by looking for differences in agronomic characteristics, e.g., changes in physiological and/or physical condition, including (but not limited to) vigor, growth, size, or root length, or in particular, leaf color or leaf area size. Other techniques for evaluating such plants include measuring chlorophyll fluorescence, photosynthetic rates, root growth or gas exchange rates.

The Examples below describe some representative protocols and techniques for simulating nitrogen limiting conditions and/or evaluating plants under such conditions.

One can also evaluate nitrogen stress tolerance by the ability of a plant to maintain sufficient yield (In an embodiment at least 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% yield) in field testing under simulated or naturally-occurring low or high nitrogen conditions (e.g., by measuring for substantially equivalent yield under low or high nitrogen conditions compared to normal nitrogen conditions, or by measuring for less yield loss under low or high nitrogen conditions compared to a control or reference plant).

One of ordinary skill in the art would readily recognize a suitable control or reference plant to be utilized when assessing or measuring an agronomic characteristic or phenotype of a transgenic plant in any embodiment of the present invention in which a control or preference plant is utilized (e.g., compositions or methods as described herein). For example, by way of non-limiting illustrations:

1. Progeny of a transformed plant which is hemizygous with respect to a recombinant DNA construct (or suppression DNA construct), such that the progeny are segregating into plants either comprising or not comprising the recombinant DNA construct (or suppression DNA construct): the progeny comprising the recombinant DNA construct (or suppression DNA construct) would be typically measured relative to the progeny not comprising the recombinant DNA construct (or suppression DNA construct) (i.e., the progeny not comprising the recombinant DNA construct (or the suppression DNA construct) is the control or reference plant).

2. Introgression of a recombinant DNA construct (or suppression DNA construct) into an inbred line, such as in maize, or into a variety, such as in soybean: the introgressed line would typically be measured relative to the parent inbred or variety line (i.e., the parent inbred or variety line is the control or reference plant).

3. Two hybrid lines, where the first hybrid line is produced from two parent inbred lines, and the second hybrid line is produced from the same two parent inbred lines except that one of the parent inbred lines contains a recombinant DNA construct (or suppression DNA construct): the second hybrid line would typically be measured relative to the first hybrid line (i.e., the first hybrid line is the control or reference plant).

4. A plant comprising a recombinant DNA construct (or suppression DNA construct): the plant may be assessed or measured relative to a control plant not comprising the recombinant DNA construct (or suppression DNA construct) but otherwise having a comparable genetic background to the plant (e.g., sharing at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity of nuclear genetic material compared to the plant comprising the recombinant DNA construct (or suppression DNA construct)). There are many laboratory-based techniques available for the analysis, comparison and characterization of plant genetic backgrounds; among these are Isozyme Electrophoresis, Restriction Fragment Length Polymorphisms (RFLPs), Randomly Amplified Polymorphic DNAs (RAPDs), Arbitrarily Primed Polymerase Chain Reaction (AP-PCR), DNA Amplification Fingerprinting (DAF), Sequence Characterized Amplified Regions (SCARs), Amplified Fragment Length Polymorphisms (AFLP®s), and Simple Sequence Repeats (SSRs) which are also referred to as Microsatellites.

Furthermore, one of ordinary skill in the art would readily recognize that a suitable control or reference plant to be utilized when assessing or measuring an agronomic characteristic or phenotype of a transgenic plant would not include a plant that had been previously selected, via mutagenesis or transformation, for the desired agronomic characteristic or phenotype.

Other Methods

Other methods include but are not limited to methods for increasing nitrogen stress tolerance in a plant, methods for evaluating nitrogen stress tolerance in a plant, methods for altering an agronomic characteristic in a plant, methods for determining an alteration of an agronomic characteristic in a plant, and methods for producing seed. In an embodiment, the plant is a monocotyledonous or dicotyledonous plant, a maize or soybean plant, even more In an embodiment a maize plant. The plant may also be sunflower, sorghum, canola, wheat, alfalfa, cotton, rice, barley, or millet. The seed is can be a maize or soybean seed a maize seed, and even more In an embodiment, a maize hybrid seed or maize inbred seed.

Particularly other methods include but are not limited to the following:

A method of increasing nitrogen stress tolerance in a plant, comprising: (a) introducing into a regenerable plant cell a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence (in an embodiment a promoter functional in a plant), wherein the polynucleotide encodes a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; and (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the recombinant DNA construct and exhibits increased nitrogen stress tolerance when compared to a control plant not comprising the recombinant DNA construct. The method may further comprise (c) obtaining a progeny plant derived from the transgenic plant, wherein said progeny plant comprises in its genome the suppression DNA construct and exhibits increased nitrogen tolerance when compared to a control plant not comprising the recombinant DNA construct.

A method of increasing nitrogen stress tolerance in a plant, comprising: (a) introducing into a regenerable plant cell a suppression DNA construct comprising at least one regulatory sequence (in an embodiment a promoter functional in a plant) operably linked to all or part of (i) a nucleic acid sequence encoding a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32, or (ii) a full complement of the nucleic acid sequence of (a)(i); and (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the suppression DNA construct and exhibits increased nitrogen stress tolerance when compared to a control plant not comprising the suppression DNA construct. The method may further comprise (c) obtaining a progeny plant derived from the transgenic plant, wherein said progeny plant comprises in its genome the suppression DNA construct and exhibits increased nitrogen tolerance when compared to a control plant not comprising the suppression DNA construct.

A method of increasing nitrogen stress tolerance in a plant, comprising: (a) introducing into a regenerable plant cell a suppression DNA construct comprising at least one regulatory sequence (in an embodiment a promoter functional in a plant) operably linked to a region derived from all or part of a sense strand or antisense strand of a target gene of interest, said region having a nucleic acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to said all or part of a sense strand or antisense strand from which said region is derived, and wherein said target gene of interest encodes an LNT2 or LNT2-like polypeptide; and (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the suppression DNA construct and exhibits increased nitrogen stress tolerance when compared to a control plant not comprising the suppression DNA construct. The method may further comprise (c) obtaining a progeny plant derived from the transgenic plant, wherein said progeny plant comprises in its genome the suppression DNA construct and exhibits increased nitrogen tolerance when compared to a control plant not comprising the suppression DNA construct.

A method of evaluating nitrogen stress tolerance in a plant, comprising (a) introducing into a regenerable plant cell a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence (in an embodiment a promoter functional in a plant), wherein the polynucleotide encodes a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the recombinant DNA construct; and (c) evaluating the transgenic plant for nitrogen stress tolerance compared to a control plant not comprising the recombinant DNA construct. The method may further comprise (d) obtaining a progeny plant derived from the transgenic plant, wherein the progeny plant comprises in its genome the recombinant DNA construct; and (e) evaluating the progeny plant for nitrogen stress tolerance compared to a control plant not comprising the recombinant DNA construct.

A method of evaluating nitrogen stress tolerance in a plant, comprising (a) introducing into a regenerable plant cell a suppression DNA construct comprising at least one regulatory sequence (in an embodiment a promoter functional in a plant) operably linked to all or part of (i) a nucleic acid sequence encoding a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; or (ii) a full complement of the nucleic acid sequence of (a)(i); (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the suppression DNA construct; and (c) evaluating the transgenic plant for nitrogen stress tolerance compared to a control plant not comprising the suppression DNA construct. The method may further comprise (d) obtaining a progeny plant derived from the transgenic plant, wherein the progeny plant comprises in its genome the suppression DNA construct; and (e) evaluating the progeny plant for nitrogen stress tolerance compared to a control plant not comprising the suppression DNA construct.

A method of evaluating nitrogen stress tolerance in a plant, comprising (a) introducing into a regenerable plant cell a suppression DNA construct comprising at least one regulatory sequence (in an embodiment a promoter functional in a plant) operably linked to a region derived from all or part of a sense strand or antisense strand of a target gene of interest, said region having a nucleic acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to said all or part of a sense strand or antisense strand from which said region is derived, and wherein said target gene of interest encodes an LNT2 or LNT2-like polypeptide; (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the suppression DNA construct; and (c) evaluating the transgenic plant for nitrogen stress tolerance compared to a control plant not comprising the suppression DNA construct. The method may further comprise (d) obtaining a progeny plant derived from the transgenic plant, wherein the progeny plant comprises in its genome the suppression DNA construct; and (e) evaluating the progeny plant for nitrogen stress tolerance compared to a control plant not comprising the suppression DNA construct.

A method of evaluating nitrogen stress tolerance in a plant, comprising (a) introducing into a regenerable plant cell a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence (in an embodiment a promoter functional in a plant), wherein said polynucleotide encodes a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the recombinant DNA construct; (c) obtaining a progeny plant derived from said transgenic plant, wherein the progeny plant comprises in its genome the recombinant DNA construct; and (d) evaluating the progeny plant for nitrogen stress tolerance compared to a control plant not comprising the recombinant DNA construct.

A method of evaluating nitrogen stress tolerance in a plant, comprising (a) introducing into a regenerable plant cell a suppression DNA construct comprising at least one regulatory sequence (in an embodiment a promoter functional in a plant) operably linked to all or part of (i) a nucleic acid sequence encoding a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; or (ii) a full complement of the nucleic acid sequence of (a)(i); (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the suppression DNA construct; (c) obtaining a progeny plant derived from said transgenic plant, wherein the progeny plant comprises in its genome the suppression DNA construct; and (d) evaluating the progeny plant for nitrogen stress tolerance compared to a control plant not comprising the recombinant DNA construct.

A method of evaluating nitrogen stress tolerance in a plant, comprising (a) introducing into a regenerable plant cell a suppression DNA construct comprising at least one regulatory sequence (in an embodiment a promoter functional in a plant) operably linked to a region derived from all or part of a sense strand or antisense strand of a target gene of interest, said region having a nucleic acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to said all or part of a sense strand or antisense strand from which said region is derived, and wherein said target gene of interest encodes an LNT2 or LNT2-like polypeptide; (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the suppression DNA construct; (c) obtaining a progeny plant derived from the transgenic plant, wherein the progeny plant comprises in its genome the suppression DNA construct; and (d) evaluating the progeny plant for nitrogen stress tolerance compared to a control plant not comprising the recombinant DNA construct.

A method of determining an alteration of an agronomic characteristic in a plant, comprising (a) introducing into a regenerable plant cell a recombinant DNA construct comprising a polynucleotide operably linked to at least on regulatory sequence (in an embodiment a promoter functional in a plant), wherein said polynucleotide encodes a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome said recombinant DNA construct; and (c) determining whether the transgenic plant exhibits an alteration of at least one agronomic characteristic when compared, in an embodiment under nitrogen limiting conditions, to a control plant not comprising the recombinant DNA construct. The method may further comprise (d) obtaining a progeny plant derived from the transgenic plant, wherein the progeny plant comprises in its genome the recombinant DNA construct; and (e) determining whether the progeny plant exhibits an alteration of at least one agronomic characteristic when compared, in an embodiment under nitrogen limiting conditions, to a control plant not comprising the recombinant DNA construct.

A method of determining an alteration of an agronomic characteristic in a plant, comprising (a) introducing into a regenerable plant cell a suppression DNA construct comprising at least one regulatory sequence (in an embodiment a promoter functional in a plant) operably linked to all or part of (i) a nucleic acid sequence encoding a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; or (ii) a full complement of the nucleic acid sequence of (i); (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the suppression DNA construct; and (c) determining whether the transgenic plant exhibits an alteration of at least one agronomic characteristic when compared, in an embodiment under nitrogen limiting conditions, to a control plant not comprising the suppression DNA construct. The method may further comprise (d) obtaining a progeny plant derived from the transgenic plant, wherein the progeny plant comprises in its genome the suppression DNA construct; and (e) determining whether the progeny plant exhibits an alteration of at least one agronomic characteristic when compared, in an embodiment under nitrogen limiting conditions, to a control plant not comprising the suppression DNA construct.

A method of determining an alteration of an agronomic characteristic in a plant, comprising (a) introducing into a regenerable plant cell a suppression DNA construct comprising at least one regulatory sequence (in an embodiment a promoter functional in a plant) operably linked to a region derived from all or part of a sense strand or antisense strand of a target gene of interest, said region having a nucleic acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to said all or part of a sense strand or antisense strand from which said region is derived, and wherein said target gene of interest encodes an LNT2 or LNT2-like polypeptide; (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the suppression DNA construct; and (c) determining whether the transgenic plant exhibits an alteration of at least one agronomic characteristic when compared, in an embodiment under nitrogen limiting conditions, to a control plant not comprising the suppression DNA construct. The method may further comprise (d) obtaining a progeny plant derived from the transgenic plant, wherein the progeny plant comprises in its genome the suppression DNA construct; and (e) determining whether the progeny plant exhibits an alteration of at least one agronomic characteristic when compared, in an embodiment under nitrogen limiting conditions, to a control plant not comprising the suppression DNA construct.

A method of determining an alteration of an agronomic characteristic in a plant, comprising (a) introducing into a regenerable plant cell a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence (in an embodiment a promoter functional in a plant), wherein said polynucleotide encodes a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome said recombinant DNA construct; (c) obtaining a progeny plant derived from said transgenic plant, wherein the progeny plant comprises in its genome the recombinant DNA construct; and (d) determining whether the progeny plant exhibits an alteration of at least one agronomic characteristic when compared, in an embodiment under nitrogen limiting conditions, to a control plant not comprising the recombinant DNA construct.

A method of determining an alteration of an agronomic characteristic in a plant, comprising (a) introducing into a regenerable plant cell a suppression DNA construct comprising at least one regulatory sequence (in an embodiment a promoter functional in a plant) operably linked to all or part of (i) a nucleic acid sequence encoding a polypeptide having an amino acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:18, 20, 24, 26, 28, 30, or 32; or (ii) a full complement of the nucleic acid sequence of (i); (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the suppression DNA construct; (c) obtaining a progeny plant derived from said transgenic plant, wherein the progeny plant comprises in its genome the suppression DNA construct; and (d) determining whether the progeny plant exhibits an alteration of at least one agronomic characteristic when compared, in an embodiment under nitrogen limiting conditions, to a control plant not comprising the recombinant DNA construct.

A method of determining an alteration of an agronomic characteristic in a plant, comprising (a) introducing into a regenerable plant cell a suppression DNA construct comprising at least one regulatory sequence (in an embodiment a promoter functional in a plant) operably linked to a region derived from all or part of a sense strand or antisense strand of a target gene of interest, said region having a nucleic acid sequence of at least 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 56%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity, based on the Clustal V method of alignment, when compared to said all or part of a sense strand or antisense strand from which said region is derived, and wherein said target gene of interest encodes an LNT2 or LNT2-like polypeptide; (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the suppression DNA construct; (c) obtaining a progeny plant derived from said transgenic plant, wherein the progeny plant comprises in its genome the suppression DNA construct; and (d) determining whether the progeny plant exhibits an alteration of at least one agronomic characteristic when compared, in an embodiment under nitrogen limiting conditions, to a control plant not comprising the suppression DNA construct.

A method of producing seed (in an embodiment seed that can be sold as a nitrogen stress tolerant product offering) comprising any of the preceding other methods, and further comprising obtaining seeds from said progeny plant, wherein said seeds comprise in their genome said recombinant DNA construct (or suppression DNA construct).

In any of the foregoing other methods or any other embodiments of methods of the present invention, the step of determining an alteration of an agronomic characteristic in a transgenic plant, if applicable, may in an embodiment comprise determining whether the transgenic plant exhibits an alteration of at least one agronomic characteristic when compared, under varying environmental conditions, to a control plant not comprising the recombinant DNA construct.

In any of the foregoing other methods or any other embodiments of methods of the present invention, the step of determining an alteration of an agronomic characteristic in a progeny plant, if applicable, may comprise determining whether the progeny plant exhibits an alteration of at least one agronomic characteristic when compared, under varying environmental conditions, to a control plant not comprising the recombinant DNA construct.

In any of the preceding other methods or any other embodiments of methods of the present invention, in said introducing step said regenerable plant cell may comprises a callus cell (in an embodiment embryogenic), a gametic cell, a meristematic cell, or a cell of an immature embryo. The regenerable plant cells are in an embodiment from an inbred maize plant.

In any of the preceding other methods or any other embodiments of methods of the present invention, said regenerating step in an embodiment comprises: (i) culturing said transformed plant cells in a media comprising an embryogenic promoting hormone until callus organization is observed; (ii) transferring said transformed plant cells of step (i) to a first media which includes a tissue organization promoting hormone; and (iii) subculturing said transformed plant cells after step (ii) onto a second media, to allow for shoot elongation, root development or both.

In any of the preceding other methods or any other embodiments of methods of the present invention, the at least one agronomic characteristic is selected from the group consisting of greenness, yield, growth rate, biomass, fresh weight at maturation, dry weight at maturation, fruit yield, seed yield, total plant nitrogen content, fruit nitrogen content, seed nitrogen content, nitrogen content in a vegetative tissue, whole plant amino acid content, vegetative tissue free amino acid content, fruit free amino acid content, seed free amino acid content, total plant protein content, fruit protein content, seed protein content, protein content in a vegetative tissue, drought tolerance, nitrogen uptake, resistance to root lodging, harvest index, stalk lodging, plant height, ear height, and ear length. Yield, greenness and biomass are particularly other agronomic characteristics for alteration (in an embodiment an increase).

In any of the preceding other methods or any other embodiments of methods of the present invention, the plant in an embodiment exhibits the alteration of at least one agronomic characteristic when compared, under nitrogen stress conditions, to a control plant not comprising said recombinant DNA construct (or suppression DNA construct).

In any of the preceding other methods or any other embodiments of methods of the present invention, alternatives exist for introducing into a regenerable plant cell a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence. For example, one may introduce into a regenerable plant cell a regulatory sequence (such as one or more enhancers, in an embodiment as part of a transposable element), and then screen for an event in which the regulatory sequence is operably linked to an endogenous gene encoding a polypeptide of the instant invention.

The introduction of recombinant DNA constructs of the present invention into plants may be carried out by any suitable technique, including but not limited to direct DNA uptake, chemical treatment, electroporation, microinjection, cell fusion, infection, vector mediated DNA transfer, bombardment, or Agrobacterium mediated transformation.

Other techniques are set forth below in the Examples below for transformation of maize plant cells and soybean plant cells.

Other methods for transforming dicots, primarily by use of Agrobacterium tumefaciens, and obtaining transgenic plants include those published for cotton (U.S. Pat. Nos. 5,004,863, 5,159,135, 5,518,908); soybean (U.S. Pat. Nos. 5,569,834, 5,416,011, McCabe et. al., Bio/Technology 6:923 (1988), Christou et al., Plant Physiol. 87:671 674 (1988)); Brassica (U.S. Pat. No. 5,463,174); peanut (Cheng et al., Plant Cell Rep. 15:653 657 (1996), McKently et al., Plant Cell Rep. 14:699 703 (1995)); papaya; and pea (Grant et al., Plant Cell Rep. 15:254-258 (1995)).

Transformation of monocotyledons using electroporation, particle bombardment, and Agrobacterium have also been reported and are included as other methods, for example, transformation and plant regeneration as achieved in asparagus (Bytebier et al., Proc. Natl. Acad. Sci. U.S.A. 84:5354, (1987)); barley (Wan and Lemaux, Plant Physiol. 104:37 (1994)); corn (Rhodes et al., Science 240:204 (1988), Gordon-Kamm et al., Plant Cell 2:603 618 (1990), Fromm et al., Bio/Technology 8:833 (1990), Koziel et al., Bio/Technology 11:194 (1993), Armstrong et al., Crop Science 35:550-557 (1995)); oat (Somers et al., Bio/Technology 10:1589 (1992)); orchard grass (Horn et al., Plant Cell Rep. 7:469 (1988)); rice (Toriyama et al., Theor. Appl. Genet. 205:34 (1986); Part et al., Plant Mol. Biol. 32:1135 1148, (1996); Abedinia et al., Aust. J. Plant Physiol. 24:133 141 (1997); Zhang and Wu, Theor. Appl. Genet. 76:835 (1988); Zhang et al., Plant Cell Rep. 7:379, (1988); Battraw and Hall, Plant Sci. 86:191 202 (1992); Christou et al., Bio/Technology 9:957 (1991)); rye (De la Pena et al., Nature 325:274 (1987)); sugarcane (Bower and Birch, Plant J. 2:409 (1992)); tall fescue (Wang et al., Bio/Technology 10:691 (1992)); and wheat (Vasil et al., Bio/Technology 10:667 (1992); U.S. Pat. No. 5,631,152).

There are a variety of methods for the regeneration of plants from plant tissue. The particular method of regeneration will depend on the starting plant tissue and the particular plant species to be regenerated.

The regeneration, development, and cultivation of plants from single plant protoplast transformants or from various transformed explants is well known in the art (Weissbach and Weissbach, In: Methods for Plant Molecular Biology, (Eds.), Academic Press, Inc. San Diego, Calif., (1988)). This regeneration and growth process typically includes the steps of selection of transformed cells, culturing those individualized cells through the usual stages of embryonic development through the rooted plantlet stage. Transgenic embryos and seeds are similarly regenerated. The resulting transgenic rooted shoots are thereafter planted in an appropriate plant growth medium such as soil.

The development or regeneration of plants containing the foreign, exogenous isolated nucleic acid fragment that encodes a protein of interest is well known in the art. In an embodiment, the regenerated plants are self-pollinated to provide homozygous transgenic plants. Otherwise, pollen obtained from the regenerated plants is crossed to seed-grown plants of agronomically important lines. Conversely, pollen from plants of these important lines is used to pollinate regenerated plants. A transgenic plant of the present invention containing a desired polypeptide is cultivated using methods well known to one skilled in the art.

EXAMPLES

The present invention is further illustrated in the following Examples, in which parts and percentages are by weight and degrees are Celsius, unless otherwise stated. It should be understood that these Examples, while indicating other embodiments of the invention, are given by way of illustration only. From the above discussion and these Examples, one skilled in the art can ascertain the essential characteristics of this invention, and without departing from the spirit and scope thereof, can make various changes and modifications of the invention to adapt it to various usages and conditions. Furthermore, various modifications of the invention in addition to those shown and described herein will be apparent to those skilled in the art from the foregoing description. Such modifications are also intended to fall within the scope of the appended claims.

Example 1 Creation of an Arabidopsis Population with Activation-Tagged Genes

An 18.49-kb T-DNA based binary construct was created, pHSbarENDs2 (SEQ ID NO:1; FIG. 1), that contains four multimerized enhancer elements derived from the Cauliflower Mosaic Virus 35S promoter (corresponding to sequences −341 to −64, as defined by Odell et al., Nature 313:810-812 (1985)). The construct also contains vector sequences (pUC9) and a poly-linker (SEQ ID NO:11) to allow plasmid rescue, transposon sequences (Ds) to remobilize the T-DNA, and the bar gene to allow for glufosinate selection of transgenic plants. In principle, only the 10.8-kb segment from the right border (RB) to left border (LB) inclusive will be transferred into the host plant genome. Since the enhancer elements are located near the RB, they can induce cis-activation of genomic loci following T-DNA integration.

Arabidopsis activation-tagged populations were created by whole plant Agrobacterium transformation. The pHSbarENDs2 construct was transformed into Agrobacterium tumefaciens strain C58, grown in lysogeny broth medium at 25° C. to OD600˜1.0. Cells were then pelleted by centrifugation and resuspended in an equal volume of 5% sucrose/0.05% Silwet L-77 (OSI Specialties, Inc). At early bolting, soil grown Arabidopsis thaliana ecotype Col-0 were top watered with the Agrobacterium suspension. A week later, the same plants were top watered again with the same Agrobacterium strain in sucrose/Silwet. The plants were then allowed to set seed as normal. The resulting T1 seed were sown on soil, and transgenic seedlings were selected by spraying with glufosinate (FINALE®; AgrEvo; Bayer Environmental Science). A total of 100,000 glufosinate resistant T1 seedlings were selected. T2 seed from each line was kept separate.

Example 2 Screens to Identify Lines with Tolerance to Low Nitrogen

From each of 100,000 separate T1 activation-tagged lines, eleven T2 plants are sown on square plates (15 mm×15 mm) containing 0.5×N-Free Hoagland's, 0.4 mM potassium nitrate, 0.1% sucrose, 1 mM MES and 0.25% Phytagel™ (Low N medium). Five lines are plated per plate, and the inclusion of 9 wild-type individuals on each plate makes for a total of 64 individuals in an 8×8 grid pattern (see FIG. 11). Plates are kept for three days in the dark at 4° C. to stratify seeds, and then placed horizontally for nine days at 22° C. light and 20° C. dark. Photoperiod is sixteen hours light and eight hours dark, with an average light intensity of ˜200 mmol/m²/s. Plates are rotated and shuffled daily within each shelf. At day twelve (nine days of growth), seedling status is evaluated by imaging the entire plate.

After masking the plate image to remove background color, two different measurements are collected for each individual: total rosette area, and the percentage of color that falls into a green color bin. Using hue, saturation and intensity data (HSI), the green color bin consists of hues 50 to 66. Total rosette area is used as a measure of plant biomass, whereas the green color bin was shown by dose-response studies to be an indicator of nitrogen assimilation (see FIG. 12).

Lines with a significant increase in total rosette area and/or green color bin, when compared to the wild-type controls, are designated as Phase 1 hits. Phase 1 hits are re-screened in duplicate under the same assay conditions (Phase 2 screen). A Phase 3 screen is also employed to further validate mutants that passed through Phases 1 and 2. In Phase 3, each line is plated separately on Low N medium, such that 32 T2 individuals are grown next to 32 wild-type individuals on one plate, providing greater statistical rigor to the analysis. If a line shows a significant difference from the controls in Phase 3, the line is then considered a validated nitrogen-deficiency tolerant line.

Example 3 Identification of Activation-Tagged Genes

Genes flanking the T-DNA insert in nitrogen tolerant lines are identified using one, or both, of the following two standard procedures: (1) thermal asymmetric interlaced (TAIL) PCR (Liu et al., Plant J. 8:457-63 (1995)); and (2) SAIFF PCR (Siebert et al., Nucleic Acids Res. 23:1087-1088 (1995)). In lines with complex multimerized T-DNA inserts, TAIL PCR and SAIFF PCR may both prove insufficient to identify candidate genes. In these cases, other procedures, including inverse PCR, plasmid rescue and/or genomic library construction, can be employed.

A successful result is one where a single TAIL or SAIFF PCR fragment contains a T-DNA border sequence and Arabidopsis genomic sequence. Once a tag of genomic sequence flanking a T-DNA insert is obtained, candidate genes are identified by alignment to publicly available Arabidopsis genome sequence. Specifically, the annotated gene nearest the 35S enhancer elements/T-DNA RB are candidates for genes that are activated.

To verify that an identified gene is truly near a T-DNA and to rule out the possibility that the TAIL/SAIFF fragment is a chimeric cloning artifact, a diagnostic PCR on genomic DNA is done with one oligo in the T-DNA and one oligo specific for the candidate gene. Genomic DNA samples that give a PCR product are interpreted as representing a T-DNA insertion. This analysis also verifies a situation in which more than one insertion event occurs in the same line, e.g., if multiple differing genomic fragments are identified in TAIL and/or SAIFF PCR analyses.

Example 4 Identification of Activation-Tagged LNT2 Gene

An activation tagged-line (line 111786) showing nitrogen-deficiency tolerance was further analyzed. DNA from the line was extracted, and genes flanking the T-DNA insert in the mutant line were identified using ligation-mediated PCR (Siebert et al., Nucleic Acids Res. 23:1087-1088 (1995)). A single amplified fragment was identified that contained a T-DNA border sequence and Arabidopsis genomic sequence. Once a tag of genomic sequence flanking a T-DNA insert was obtained, a candidate gene was identified by alignment to the completed Arabidopsis genome. Specifically, the annotated gene nearest the 35S enhancer elements/T-DNA RB was the candidate for the gene activated in the line. In the case of line 111786 the gene nearest the 35S enhancers was At5g50930 (SEQ ID NO:27) encoding the Arabidopsis thaliana “unknown protein” referred to herein as LNT2 (SEQ ID NO:28; NCBI GI 15241317).

Example 5 Validation of Candidate Arabidopsis Gene (At5g50930) via Transformation into Arabidopsis

Candidate genes can be transformed into Arabidopsis and overexpressed under the 35S promoter. If the same or similar phenotype is observed in the transgenic line as in the parent activation-tagged line, then the candidate gene is considered to be a validated “lead gene” in Arabidopsis.

The Arabidopsis At5g50930 gene (SEQ ID NO:27) was tested for its ability to confer nitrogen-deficiency tolerance in the following manner.

The At5g50930 cDNA was amplified by RT-PCR with the following primers:

1. At5g50930-5′ attB forward primer (SEQ ID NO:35)

The forward primer contains the attB1 sequence (ACAAGTTTGTACAAAAAAGCAGGCT; SEQ ID NO:12) and a consensus Kozak sequence (CAACA) upstream of the first 21 nucleotides of the protein-coding region, beginning with the ATG start codon, of said cDNA.

2. At5g50930-3′ attB reverse primer (SEQ ID NO:36)

The reverse primer contains the attB2 sequence (ACCACTTTGTACAAGAAAGCTGGGT; SEQ ID NO:13) adjacent to the reverse complement of the last 21 nucleotides of the protein-coding region, beginning with the reverse complement of the stop codon, of said cDNA.

The RT-PCR reaction yielded two products, referred to herein as Int2-2 and Int2-3 (SEQ ID NOs:29 and 31, respectively). The products were identified as splice variants of the At5g50930 gene.

Using the INVITROGEN™ GATEWAY® CLONASE™ technology, a BP Recombination Reaction was performed for each RT-PCR product with pDONR™ Zeo (SEQ ID NO:2; FIG. 2). This process removes the bacteria lethal ccdB gene, as well as the chloramphenicol resistance gene (CAM), from pDONR™ Zeo and directionally clones the PCR product with flanking attB1 and attB2 sites, creating an entry clone. One positively identified entry clone for each splice variant sequence was used for a subsequent LR Recombination Reaction with a destination vector, as follows.

A 16.8-kb T-DNA based binary vector (destination vector), called pBC-yellow (SEQ ID NO:4; FIG. 4), was constructed with a 1.3-kb 35S promoter immediately upstream of the INVITROGEN™ GATEWAY C1 conversion insert, which contains the bacterial lethal ccdB gene as well as the chloramphenicol resistance gene (CAM) flanked by attR1 and attR2 sequences. The vector also contains the RD29a promoter driving expression of the gene for ZS-Yellow (INVITROGEN™), which confers yellow fluorescence to transformed seed. Using the INVITROGEN™ GATEWAY® technology, an LR Recombination Reaction was performed with the entry clone containing Int2-2 and the pBC-yellow vector. This amplification allowed for rapid and directional cloning of Int2-2 (SEQ ID NO: 29) behind the 35S promoter in pBC-yellow. An LR Recombination Reaction was also performed with the entry clone containing Int2-3 and the pBC-yellow vector.

Applicants then introduced the 35S promoter:At5g50930 expression constructs into wild-type Arabidopsis ecotype Col-0, using the same Agrobacterium-mediated transformation procedure described in Example 1. Transgenic T1 seeds were selected by yellow fluorescence, and 32 of these T1 seeds were plated next to 32 wild-type Arabidopsis ecotype Col-0 seeds on low nitrogen medium. All subsequent growth and imaging conditions were performed as described in Example 1. It was found that the original phenotype from activation tagging, tolerance to nitrogen limiting conditions, could be recapitulated in wild-type Arabidopsis plants that were transformed with a construct where an At5g50930 gene was directly expressed by the 35S promoter.

Example 6 Composition of cDNA Libraries, Isolation and Sequencing of cDNA Clones

cDNA libraries may be prepared by any one of many methods available. For example, the cDNAs may be introduced into plasmid vectors by first preparing the cDNA libraries in UNI-ZAP™ XR vectors according to the manufacturer's protocol (Stratagene Cloning Systems, La Jolla, Calif.). The UNI-ZAP™ XR libraries are converted into plasmid libraries according to the protocol provided by Stratagene. Upon conversion, cDNA inserts will be contained in the plasmid vector pBLUESCRIPT®. In addition, the cDNAs may be introduced directly into precut BLUESCRIPT® II SK(+) vectors (Stratagene) using T4 DNA ligase (New England Biolabs), followed by transfection into DH10B cells according to the manufacturer's protocol (GIBCO BRL Products). Once the cDNA inserts are in plasmid vectors, plasmid DNAs are prepared from randomly picked bacterial colonies containing recombinant pBLUESCRIPT® plasmids, or the insert cDNA sequences are amplified via polymerase chain reaction using primers specific for vector sequences flanking the inserted cDNA sequences. Amplified insert DNAs or plasmid DNAs are sequenced in dye-primer sequencing reactions to generate partial cDNA sequences (expressed sequence tags or “ESTs”; see Adams et al., Science 252:1651-1656 (1991)). The resulting ESTs are analyzed using a Perkin Elmer Model 377 fluorescent sequencer.

Full-insert sequence (FIS) data is generated utilizing a modified transposition protocol. Clones identified for FIS are recovered from archived glycerol stocks as single colonies, and plasmid DNAs are isolated via alkaline lysis. Isolated DNA templates are reacted with vector primed M13 forward and reverse oligonucleotides in a PCR-based sequencing reaction and loaded onto automated sequencers. Confirmation of clone identification is performed by sequence alignment to the original EST sequence from which the FIS request is made.

Confirmed templates are transposed via the Primer Island transposition kit (PE Applied Biosystems, Foster City, Calif.) which is based upon the Saccharomyces cerevisiae Ty1 transposable element (Devine and Boeke, Nucleic Acids Res. 22:3765-3772 (1994)). The in vitro transposition system places unique binding sites randomly throughout a population of large DNA molecules. The transposed DNA is then used to transform DH10B electro-competent cells (GIBCO BRL/Life Technologies, Rockville, Md.) via electroporation. The transposable element contains an additional selectable marker (named DHFR; Fling and Richards, Nucleic Acids Res. 11:5147-5158 (1983)), allowing for dual selection on agar plates of only those subclones containing the integrated transposon. Multiple subclones are randomly selected from each transposition reaction, plasmid DNAs are prepared via alkaline lysis, and templates are sequenced (ABI PRISM dye-terminator ReadyReaction mix) outward from the transposition event site, utilizing unique primers specific to the binding sites within the transposon.

Sequence data is collected (ABI PRISM® Collections) and assembled using Phred and Phrap (Ewing et al., Genome Res. 8:175-185 (1998); Ewing et al., Genome Res. 8:186-194 (1998)). Phred is a public domain software program which re-reads the ABI sequence data, re-calls the bases, assigns quality values, and writes the base calls and quality values into editable output files. The Phrap sequence assembly program uses these quality values to increase the accuracy of the assembled sequence contigs. Assemblies are viewed by the Consed sequence editor (Gordon et al., Genome Res. 8:195-202 (1998)).

In some of the clones the cDNA fragment corresponds to a portion of the 3′-terminus of the gene and does not cover the entire open reading frame. In order to obtain the upstream information one of two different protocols is used. The first of these methods results in the production of a fragment of DNA containing a portion of the desired gene sequence while the second method results in the production of a fragment containing the entire open reading frame. Both of these methods use two rounds of PCR amplification to obtain fragments from one or more libraries. The libraries sometimes are chosen based on previous knowledge that the specific gene should be found in a certain tissue and sometimes are randomly-chosen. Reactions to obtain the same gene may be performed on several libraries in parallel or on a pool of libraries. Library pools are normally prepared using from 3 to 5 different libraries and normalized to a uniform dilution. In the first round of amplification both methods use a vector-specific (forward) primer corresponding to a portion of the vector located at the 5′-terminus of the clone coupled with a gene-specific (reverse) primer. The first method uses a sequence that is complementary to a portion of the already known gene sequence while the second method uses a gene-specific primer complementary to a portion of the 3′-untranslated region (also referred to as UTR). In the second round of amplification a nested set of primers is used for both methods. The resulting DNA fragment is ligated into a pBLUESCRIPT® vector using a commercial kit and following the manufacturer's protocol. This kit is selected from many available from several vendors including INVITROGEN™ (Carlsbad, Calif.), Promega Biotech (Madison, Wis.), and GIBCO-BRL (Gaithersburg, Md.). The plasmid DNA is isolated by alkaline lysis method and submitted for sequencing and assembly using Phred/Phrap, as above.

Example 7 Identification of cDNA Clones

cDNA clones encoding LNT2-like polypeptides are identified by conducting BLAST (Basic Local Alignment Search Tool; Altschul et al., J. Mol. Biol. 215:403-410 (1993); see also the explanation of the BLAST algorithm on the world wide web site for the National Center for Biotechnology Information at the National Library of Medicine of the National Institutes of Health) searches for similarity to amino acid sequences contained in the BLAST “nr” database (comprising all non-redundant GenBank CDS translations, sequences derived from the 3-dimensional structure Brookhaven Protein Data Bank, the last major release of the SWISS-PROT protein sequence database, EMBL, and DDBJ databases). The DNA sequences from clones can be translated in all reading frames and compared for similarity to all publicly available protein sequences contained in the “nr” database using the BLASTX algorithm (Gish and States, Nat. Genet. 3:266-272 (1993)) provided by the NCBI. The polypeptides encoded by the cDNA sequences can be analyzed for similarity to all publicly available amino acid sequences contained in the “nr” database using the BLASTP algorithm provided by the National Center for Biotechnology Information (NCBI). For convenience, the P-value (probability) or the E-value (expectation) of observing a match of a cDNA-encoded sequence to a sequence contained in the searched databases merely by chance as calculated by BLAST are reported herein as “pLog” values, which represent the negative of the logarithm of the reported P-value or E-value. Accordingly, the greater the pLog value, the greater the likelihood that the cDNA-encoded sequence and the BLAST “hit” represent homologous proteins.

EST sequences can be compared to the GenBank database as described above. ESTs that contain sequences more 5- or 3-prime can be found by using the BLASTN algorithm (Altschul et al., Nucleic Acids Res. 25:3389-3402 (1997)) against the Dupont proprietary database comparing nucleotide sequences that share common or overlapping regions of sequence homology. Where common or overlapping sequences exist between two or more nucleic acid fragments, the sequences can be assembled into a single contiguous nucleotide sequence, thus extending the original fragment in either the 5 or 3 prime direction. Once the most 5-prime EST is identified, its complete sequence can be determined by Full Insert Sequencing.

Homologous genes belonging to different species can be found by comparing the amino acid sequence of a known gene (from either a proprietary source or a public database) against an EST database using the tBLASTn algorithm. The tBLASTn algorithm searches an amino acid query against a nucleotide database that is translated in all 6 reading frames. This search allows for differences in nucleotide codon usage between different species, and for codon degeneracy.

Example 8 Characterization of cDNA Clones Encoding LNT2-like Polypeptides

cDNA libraries representing mRNAs from various tissues of Zea mays (maize), Oryza sativa (rice), and Glycine max (soybean) were prepared. The characteristics of the libraries are described below.

TABLE 2 cDNA Libraries from Maize, Rice, and Soybean Library Description (tissue) Clone cpg1c Corn (Zea mays L.) pooled BMS treated cpg1c.pk013.o6:fis with chemicals related to RNA, DNA synthesis rca1n Rice (Oryza sativa L., Nipponbare) callus rca1n.pk001.f6:fis normalized sfl1n1 Soybean (Glycine max L., Wye) immature sfl1n1.pk002.j1 flower normalized. sds1f Soybean (Glycine max, Wye) 11 day old sds1f.pk001.k5 seedling full length library using trehalose

As shown in Table 3, FIGS. 14A-14B, and FIG. 15, cDNAs identified in Table 2 encode polypeptides similar to the LNT2 polypeptide from Arabidopsis thaliana (At5g50930; NCBI General Identifier No. 15241317; SEQ ID NO:28) and to the LNT2-like polypeptides from Oryza sativa (GI No. 38347162 corresponding to SEQ ID NO: 33) and from Vitis vinifera (GI No. 147791927 corresponding to SEQ ID NO: 34).

Shown in Table 3 (non-patent literature) and Table 4 (patent literature) are the BLASTP results for individual ESTs (“EST”), the sequences of the entire cDNA inserts comprising the indicated cDNA clones (“FIS”), the sequences of contigs assembled from two or more EST, FIS or PCR sequences (“Contig”), or sequences encoding an entire or functional protein derived from an FIS or a contig (“CGS”). Also shown in Tables 3 and 4 are the percent sequence identity values for each pair of amino acid sequences using the Clustal V method of alignment with default parameters (described below).

TABLE 3 BLASTP Results for Polypeptides Homologous to LNT2 Polypeptides BLAST Sequence % pLog (SEQ ID NO: #) Status NCBI GI No. identity Score cpg1c.pk013.o6:fis CGS  38347162 77.4 17.8 (SEQ ID NO: 18) (SEQ ID: 33) rca1n.pk001.f6:fis CGS  38347162 100.0 15.8 (SEQ ID NO: 20) (SEQ ID: 33) PSO415619 contig 147791927 58.7 13.0 (SEQ ID NO: 24) (SEQ ID: 34) PSO415620 contig 147791927 57.1 11.8 (SEQ ID NO: 26) (SEQ ID: 34)

TABLE 4 BLASTP Results for Polypeptides Homologous to LNT2 Polypeptides BLAST Sequence % pLog (SEQ ID NO: #) Status Reference Identity score cpg1c.pk013.o6:fis CGS SEQ ID NO: 224380 92.3 21.0 (SEQ ID NO: 18) In US2004214272-A1 rca1n.pk001.f6:fis CGS SEQ ID NO: 188525 100.0 15.7 (SEQ ID NO: 20) In US2004123343-A1 PSO415619 contig SEQ ID NO: 183694 92.1 21.4 (SEQ ID NO: 24) In US2004031072-A1 PSO415620 contig SEQ ID NO: 183694 84.9 19.8 (SEQ ID NO: 26) In US2004031072-A1

FIGS. 14A and 14B present an alignment of the amino acid sequences set forth in SEQ ID NOs:18, 20, 24, 26, and the amino acid sequences of the LNT2 (At5g50930; NCBI General Identifier No. 15241317), LNT2-2, and LNT2-3 polypeptides from Arabidopsis thaliana (SEQ ID NOs: 28, 30, and 32, respectively). Also included in the alignment are the LNT2-like polypeptides from Oryza sativa (GI No. 38347162 corresponding to SEQ ID NO: 33) and from Vitis vinifera (GI No. 147791927 corresponding to SEQ ID NO: 34). FIG. 15 is a chart of the percent sequence identity and the divergence values for each pair of amino acids sequences presented in FIGS. 14A and 14B.

Sequence alignments and percent identity calculations were performed using the MEGALIGN® program of the LASERGENE® bioinformatics computing suite (DNASTAR® Inc., Madison, Wis.). Multiple alignment of the sequences was performed using the Clustal method of alignment (Higgins and Sharp (1989) CABIOS. 5:151-153) with the default parameters (GAP PENALTY=10, GAP LENGTH PENALTY=10). Default parameters for pairwise alignments using the Clustal method were KTUPLE 1, GAP PENALTY=3, WINDOW=5 and DIAGONALS SAVED=5.

Example 9 Preparation of a Plant Expression Vector Containing a Homolog to the Arabidopsis Lead Gene

Sequences homologous to the lead LNT2 genes can be identified using sequence comparison algorithms such as BLAST (Basic Local Alignment Search Tool; Altschul et al., J. Mol. Biol. 215:403-410 (1993); see also the explanation of the BLAST algorithm on the world wide web site for the National Center for Biotechnology Information at the National Library of Medicine of the National Institutes of Health). Homologous LNT2-like sequences, such as the ones described in Example 8, can be PCR-amplified by either of the following methods.

Method 1 (RNA-based): If the 5′ and 3′ sequence information for the protein-coding region of an LNT2 homolog is available, gene-specific primers can be designed as outlined in Example 5. RT-PCR can be used with plant RNA to obtain a nucleic acid fragment containing the protein-coding region flanked by attB1 (SEQ ID NO:12) and attB2 (SEQ ID NO:13) sequences. The primer may contain a consensus Kozak sequence (CAACA) upstream of the start codon.

Method 2 (DNA-based): Alternatively, if a cDNA clone is available for the LNT2 homolog, the entire cDNA insert (containing 5′ and 3′ non-coding regions) can be PCR amplified. Forward and reverse primers can be designed that contain either the attB1 sequence and vector-specific sequence that precedes the cDNA insert or the attB2 sequence and vector-specific sequence that follows the cDNA insert, respectively. For a cDNA insert cloned into the vector pBLUESCRIPT SK+, the forward primer VC062 (SEQ ID NO:15) and the reverse primer VC063 (SEQ ID NO:16) can be used.

Methods 1 and 2 can be modified according to procedures known by one skilled in the art. For example, the primers of Method 1 may contain restriction sites instead of attB1 and attB2 sites, for subsequent cloning of the PCR product into a vector containing attB1 and attB2 sites. Additionally, Method 2 can involve amplification from a cDNA clone, a lambda clone, a BAC clone or genomic DNA.

A PCR product obtained by either method above can be combined with the GATEWAY® donor vector, such as pDONR™ Zeo (SEQ ID NO:2; FIG. 2) or pDONR™ 221 (SEQ ID NO:3; FIG. 3), using a BP Recombination Reaction. This process removes the bacteria lethal ccdB gene, as well as the chloramphenicol resistance gene (CAM) from pDONR™ Zeo or pDONR™ 221 and directionally clones the PCR product with flanking attB1 and attB2 sites to create an entry clone. Using the INVITROGEN™ GATEWAY® CLONASE™ technology, the sequence encoding the homologous LNT2 polypeptide from the entry clone can then be transferred to a suitable destination vector, such as pBC-Yellow (SEQ ID NO:4; FIG. 4), PHP27840 (SEQ ID NO:5; FIG. 5), or PHP23236 (SEQ ID NO:6; FIG. 6), to obtain a plant expression vector for use with Arabidopsis, soybean, and corn, respectively.

The attP1 and attP2 sites of donor vectors pDONR™/Zeo or pDONR™ 221 are shown in FIGS. 2 and 3, respectively. The attR1 and attR2 sites of destination vectors pBC-Yellow, PHP27840, and PHP23236 are shown in FIGS. 4, 5 and 6, respectively.

Alternatively a MultiSite GATEWAY® LR recombination reaction between multiple entry clones and a suitable destination vector can be performed to create an expression vector.

Example 10 Preparation of Soybean Expression Vectors and Transformation of Soybean with Validated Arabidopsis Lead Genes

Soybean plants can be transformed to overexpress each validated Arabidopsis gene or the corresponding homologs from various species in order to examine the resulting phenotype.

The same GATEWAY® entry clone described in Example 5 can be used to directionally clone each gene into the PHP27840 vector (SEQ ID NO:5; FIG. 5) such that expression of the gene is under control of the SCP1 promoter.

Soybean embryos may then be transformed with the expression vector comprising sequences encoding the instant polypeptides.

To induce somatic embryos, cotyledons, 3-5 mm in length dissected from surface sterilized, immature seeds of the soybean cultivar A2872, can be cultured in the light or dark at 26° C. on an appropriate agar medium for six to ten weeks. Somatic embryos, which produce secondary embryos, are then excised and placed into a suitable liquid medium. After repeated selection for clusters of somatic embryos which multiply as early, globular staged embryos, the suspensions are maintained as described below.

Soybean embryogenic suspension cultures can be maintained in 35 mL liquid media on a rotary shaker, 150 rpm, at 26° C. with florescent lights on a 16:8 hour day/night schedule. Cultures are subcultured every two weeks by inoculating approximately 35 mg of tissue into 35 mL of liquid medium.

Soybean embryogenic suspension cultures may then be transformed by the method of particle gun bombardment (Klein et al., Nature (London) 327:70-73 (1987), U.S. Pat. No. 4,945,050). A DUPONT BIOLISTIC™ PDS1000/HE instrument (helium retrofit) can be used for these transformations.

A selectable marker gene which can be used to facilitate soybean transformation is a chimeric gene composed of the 35S promoter from cauliflower mosaic virus (Odell et al., Nature 313:810-812 (1985)), the hygromycin phosphotransferase gene from plasmid pJR225 (from E. coli; Gritz et al., Gene 25:179-188 (1983)) and the 3′ region of the nopaline synthase gene from the T-DNA of the Ti plasmid of Agrobacterium tumefaciens. Another selectable marker gene which can be used to facilitate soybean transformation is an herbicide-resistant acetolactate synthase (ALS) gene from soybean or Arabidopsis. ALS is the first common enzyme in the biosynthesis of the branched-chain amino acids valine, leucine and isoleucine. Mutations in ALS have been identified that convey resistance to some or all of three classes of inhibitors of ALS (U.S. Pat. No. 5,013,659; the entire contents of which are herein incorporated by reference). Expression of the herbicide-resistant ALS gene can be under the control of a SAM synthetase promoter (U.S. Patent Application No. US-2003-0226166-A1; the entire contents of which are herein incorporated by reference).

To 50 μL of a 60 mg/mL 1 μm gold particle suspension is added (in order): 5 μL DNA (1 μg/μL), 20 μL spermidine (0.1 M), and 50 μL CaCl₂ (2.5 M). The particle preparation is then agitated for three minutes, spun in a microfuge for 10 seconds and the supernatant removed. The DNA-coated particles are then washed once in 400 μL 70% ethanol and resuspended in 40 μL of anhydrous ethanol. The DNA/particle suspension can be sonicated three times for one second each. Five μL of the DNA-coated gold particles are then loaded on each macro carrier disk.

Approximately 300-400 mg of a two-week-old suspension culture is placed in an empty 60×15 mm petri dish and the residual liquid removed from the tissue with a pipette. For each transformation experiment, approximately 5-10 plates of tissue are normally bombarded. Membrane rupture pressure is set at 1100 psi and the chamber is evacuated to a vacuum of 28 inches mercury. The tissue is placed approximately 3.5 inches away from the retaining screen and bombarded three times. Following bombardment, the tissue can be divided in half and placed back into liquid and cultured as described above.

Five to seven days post bombardment, the liquid media may be exchanged with fresh media, and eleven to twelve days post bombardment, with fresh media containing 50 mg/mL hygromycin. This selective media can be refreshed weekly. Seven to eight weeks post bombardment, green, transformed tissue may be observed growing from untransformed, necrotic embryogenic clusters. Isolated green tissue is removed and inoculated into individual flasks to generate new, clonally propagated, transformed embryogenic suspension cultures. Each new line may be treated as an independent transformation event. These suspensions can then be subcultured and maintained as clusters of immature embryos or regenerated into whole plants by maturation and germination of individual somatic embryos.

Soybean plants transformed with validated genes can be assayed to study agronomic characteristics relative to control or reference plants. For example, yield enhancement and/or stability under low and high nitrogen conditions (e.g., nitrogen limiting conditions and nitrogen-sufficient conditions) can be assayed.

Example 11 Transformation of Maize with Validated Arabidopsis Lead Genes Using Particle Bombardment

Maize plants can be transformed to overexpress a validated Arabidopsis lead gene or the corresponding homologs from various species in order to examine the resulting phenotype.

The same GATEWAY® entry clones described in Example 5 can be used to directionally clone each respective gene into a maize transformation vector. Expression of the gene in the maize transformation vector can be under control of a constitutive promoter such as the maize ubiquitin promoter (Christensen et al., Plant Mol. Biol. 12:619-632 (1989) and Christensen et al., Plant Mol. Biol. 18:675-689 (1992))

The recombinant DNA construct described above can then be introduced into maize cells by the following procedure. Immature maize embryos can be dissected from developing caryopses derived from crosses of the inbred maize lines H99 and LH132. The embryos are isolated ten to eleven days after pollination when they are 1.0 to 1.5 mm long. The embryos are then placed with the axis-side facing down and in contact with agarose-solidified N6 medium (Chu et al., Sci. Sin. Peking 18:659-668 (1975)). The embryos are kept in the dark at 27° C. Friable embryogenic callus consisting of undifferentiated masses of cells with somatic proembryoids and embryoids borne on suspensor structures proliferates from the scutellum of these immature embryos. The embryogenic callus isolated from the primary explant can be cultured on N6 medium and sub-cultured on this medium every two to three weeks.

The plasmid, p35S/Ac (obtained from Dr. Peter Eckes, Hoechst Ag, Frankfurt, Germany) may be used in transformation experiments in order to provide for a selectable marker. This plasmid contains the pat gene (see European Patent Publication 0 242 236) which encodes phosphinothricin acetyl transferase (PAT). The enzyme PAT confers resistance to herbicidal glutamine synthetase inhibitors such as phosphinothricin. The pat gene in p35S/Ac is under the control of the 35S promoter from cauliflower mosaic virus (Odell et al., Nature 313:810-812 (1985)) and the 3′ region of the nopaline synthase gene from the T-DNA of the Ti plasmid of Agrobacterium tumefaciens.

The particle bombardment method (Klein et al., Nature 327:70-73 (1987)) may be used to transfer genes to the callus culture cells. According to this method, gold particles (1 μm in diameter) are coated with DNA using the following technique. Ten μg of plasmid DNAs are added to 50 μL of a suspension of gold particles (60 mg per mL). Calcium chloride (50 μL of a 2.5 M solution) and spermidine free base (20 μL of a 1.0 M solution) are added to the particles. The suspension is vortexed during the addition of these solutions. After ten minutes, the tubes are briefly centrifuged (5 sec at 15,000 rpm) and the supernatant removed. The particles are resuspended in 200 μL of absolute ethanol, centrifuged again and the supernatant removed. The ethanol rinse is performed again and the particles resuspended in a final volume of 30 μl of ethanol. An aliquot (5 μl) of the DNA-coated gold particles can be placed in the center of a KAPTON™ flying disc (Bio-Rad Labs). The particles are then accelerated into the maize tissue with a BIOLISTIC™ PDS-1000/He (Bio-Rad Instruments, Hercules Calif.), using a helium pressure of 1000 psi, a gap distance of 0.5 cm and a flying distance of 1.0 cm.

For bombardment, the embryogenic tissue is placed on filter paper over agarose-solidified N6 medium. The tissue is arranged as a thin lawn and covers a circular area of about 5 cm in diameter. The petri dish containing the tissue can be placed in the chamber of the PDS-1000/He approximately 8 cm from the stopping screen. The air in the chamber is then evacuated to a vacuum of 28 inches of Hg. The macrocarrier is accelerated with a helium shock wave using a rupture membrane that bursts when the He pressure in the shock tube reaches 1000 psi.

Seven days after bombardment the tissue can be transferred to N6 medium that contains bialaphos (5 mg per liter) and lacks casein or proline. The tissue continues to grow slowly on this medium. After an additional two weeks the tissue can be transferred to fresh N6 medium containing bialaphos. After six weeks, areas of about 1 cm in diameter of actively growing callus can be identified on some of the plates containing the bialaphos-supplemented medium. These calli may continue to grow when sub-cultured on the selective medium.

Plants can be regenerated from the transgenic callus by first transferring clusters of tissue to N6 medium supplemented with 0.2 mg per liter of 2,4-D. After two weeks the tissue can be transferred to regeneration medium (Fromm et al., Bio/Technology 8:833-839 (1990)).

Transgenic TO plants can be regenerated and their phenotype determined following HTP procedures. T1 seed can be collected.

T1 plants can be grown under nitrogen limiting conditions, for example 1 mM nitrate, and analyzed for phenotypic changes. The following parameters can be quantified using image analysis: plant area, volume, growth rate and color analysis can be collected and quantified. Overexpression constructs that result in an alteration, compared to suitable control plants, in greenness (green color bin), yield, growth rate, biomass, fresh or dry weight at maturation, fruit or seed yield, total plant nitrogen content, fruit or seed nitrogen content, nitrogen content in vegetative tissue, free amino acid content in the whole plant, free amino acid content in vegetative tissue, free amino acid content in the fruit or seed, protein content in the fruit or seed, or protein content in a vegetative tissue can be considered evidence that the Arabidopsis lead gene functions in maize to enhance tolerance to nitrogen deprivation (increased nitrogen tolerance). Furthermore, a recombinant DNA construct containing a validated Arabidopsis gene can be introduced into a maize inbred line either by direct transformation or introgression from a separately transformed line.

Example 12 Electroporation of Agrobacterium tumefaciens LBA4404 (General Description)

Electroporation competent cells (40 μL), such as Agrobacterium tumefaciens LBA4404 (containing PHP10523), are thawed on ice (20-30 min). PHP10523 contains VIR genes for T-DNA transfer, an Agrobacterium low copy number plasmid origin of replication, a tetracycline resistance gene, and a Cos site for in vivo DNA bimolecular recombination. Meanwhile the electroporation cuvette is chilled on ice. The electroporator settings are adjusted to 2.1 kV. A DNA aliquot (0.5 μL parental DNA at a concentration of 0.2 μg-1.0 μg in low salt buffer or twice distilled H₂O) is mixed with the thawed Agrobacterium tumefaciens LBA4404 cells while still on ice. The mixture is transferred to the bottom of electroporation cuvette and kept at rest on ice for 1-2 min. The cells are electroporated (Eppendorf electroporator 2510) by pushing the “pulse” button twice (ideally achieving a 4.0 millisecond pulse). Subsequently, 0.5 mL of room temperature 2×YT medium (or SOC medium) are added to the cuvette and transferred to a 15 mL snap-cap tube (e.g., FALCON™ tube). The cells are incubated at 28-30° C., 200-250 rpm for 3 h.

Aliquots of 2504 are spread onto plates containing YM medium and 50 μg/mL spectinomycin and incubated three days at 28-30° C. To increase the number of transformants one of two optional steps can be performed:

Option 1: Overlay plates with 30 μm of 15 mg/mL rifampicin. LBA4404 has a chromosomal resistance gene for rifampicin. This additional selection eliminates some contaminating colonies observed when using poorer preparations of LBA4404 competent cells.

Option 2: Perform two replicates of the electroporation to compensate for poorer electrocompetent cells.

Identification of Transformants:

Four independent colonies are picked and streaked on plates containing AB minimal medium and 50 μg/mL spectinomycin for isolation of single colonies. The plates are incubated at 28° C. for two to three days. A single colony for each putative cointegrate is picked and inoculated with 4 mL of 10 g/L bactopeptone, 10 g/L yeast extract, 5 g/L sodium chloride, and 50 mg/L spectinomycin. The mixture is incubated for 24 h at 28° C. with shaking. Plasmid DNA from 4 mL of culture is isolated using QIAGEN Miniprep and an optional Buffer PB wash. The DNA is eluted in 30 μL. Aliquots of 2 μl are used to electroporate 20 μl of DH10b+20 μl of twice distilled H₂O as per above. Optionally a 15 μl aliquot can be used to transform 75-100 μl of INVITROGEN™ Library Efficiency DH5a. The cells are spread on plates containing LB medium and 50 μg/mL spectinomycin and incubated at 37° C. overnight.

Three to four independent colonies are picked for each putative cointegrate and inoculated 4 mL of 2×YT medium (10 g/L bactopeptone, 10 g/L yeast extract, 5 g/L sodium chloride) with 50 μg/mL spectinomycin. The cells are incubated at 37° C. overnight with shaking. Next, the plasmid DNA is isolated from 4 mL of culture using QIAprep® Miniprep with optional Buffer PB wash (elute in 50 4). 8 μl used for digestion with SalI (using parental DNA and PHP10523 as controls). Three more digestions using restriction enzymes BamHI, EcoRI, and HindIII are performed for 4 plasmids that represent 2 putative cointegrates with correct SalI digestion pattern (using parental DNA and PHP10523 as controls). Electronic gels are recommended for comparison.

Alternatively, for high throughput applications, such as that described for Gaspe Flint Derived Maize Lines (Example 16), instead of evaluating the resulting cointegrate vectors by restriction analysis, three colonies can be simultaneously used for the infection step as described in Example 13 (transformation via Agrobacterium).

Example 13 Transformation of Maize Using Agrobacterium

Maize plants can be transformed to overexpress a validated Arabidopsis lead gene or the corresponding homologs from various species in order to examine the resulting phenotype.

Agrobacterium-mediated transformation of maize is performed essentially as described by Zhao et al., in Meth. Mol. Biol. 318:315-323 (2006) (see also Zhao et al., Mol. Breed. 8:323-333 (2001) and U.S. Pat. No. 5,981,840 issued Nov. 9, 1999, incorporated herein by reference). The transformation process involves bacterium inoculation, co-cultivation, resting, selection, and plant regeneration.

1. Immature Embryo Preparation:

Immature maize embryos are dissected from caryopses and placed in a 2 mL microtube containing 2 mL PHI-A medium.

2. Agrobacterium Infection and Co-Cultivation of Immature Embryos:

2.1 Infection Step:

PHI-A medium of (1) is removed with 1 mL micropipettor, and 1 mL of Agrobacterium suspension is added. The tube is gently inverted to mix. The mixture is incubated for 5 min at room temperature.

2.2 Co-culture Step:

The Agrobacterium suspension is removed from the infection step with a 1 mL micropipettor. Using a sterile spatula the embryos are scraped from the tube and transferred to a plate of PHI-B medium in a 100×15 mm Petri dish. The embryos are oriented with the embryonic axis down on the surface of the medium. Plates with the embryos are cultured at 20° C., in darkness, for three days. L-Cysteine can be used in the co-cultivation phase. With the standard binary vector, the co-cultivation medium supplied with 100-400 mg/L L-cysteine is critical for recovering stable transgenic events.

3. Selection of Putative Transgenic Events:

To each plate of PHI-D medium in a 100×15 mm Petri dish, 10 embryos are transferred, maintaining orientation, and the dishes are sealed with parafilm. The plates are incubated in darkness at 28° C. Actively growing putative events, evinced as pale yellow embryonic tissue, are expected to be visible in six to eight weeks. Embryos that produce no events may be brown and necrotic, and little friable tissue growth is evident. Putative transgenic embryonic tissue is subcultured to fresh PHI-D plates at two-three week intervals, depending on growth rate. The events are recorded.

4. Regeneration of T0 plants:

Embryonic tissue propagated on PHI-D medium is subcultured to PHI-E medium (somatic embryo maturation medium), in 100×25 mm Petri dishes and incubated at 28° C., in darkness, until somatic embryos mature, for about ten to eighteen days. Individual, matured somatic embryos with well-defined scutellum and coleoptile are transferred to PHI-F embryo germination medium and incubated at 28° C. in the light (about 80 μE from cool white or equivalent fluorescent lamps). In seven to ten days, regenerated plants, about 10 cm tall, are potted in horticultural mix and hardened-off using standard horticultural methods.

Media for Plant Transformation:

-   -   1. PHI-A: 4 g/L CHU basal salts, 1.0 mL/L 1000× Eriksson's         vitamin mix, 0.5 mg/L thiamin HCl, 1.5 mg/L 2,4-D, 0.69 g/L         L-proline, 68.5 g/L sucrose, 36 g/L glucose, pH 5.2. Add 100 μM         acetosyringone (filter-sterilized).     -   2. PHI-B: PHI-A without glucose, increase 2,4-D to 2 mg/L,         reduce sucrose to 30 g/L and supplemented with 0.85 mg/L silver         nitrate (filter-sterilized), 3.0 g/L GELRITE®, 100 μM         acetosyringone (filter-sterilized), pH 5.8.     -   3. PHI-C: PHI-B without GELRITE® and acetosyringone, reduce         2,4-D to 1.5 mg/L and supplemented with 8.0 g/L agar, 0.5 g/L         2-[N-morpholino]ethane-sulfonic acid (MES) buffer, 100 mg/L         carbenicillin (filter-sterilized).     -   4. PHI-D: PHI-C supplemented with 3 mg/L bialaphos         (filter-sterilized).     -   5. PHI-E: 4.3 g/L of Murashige and Skoog (MS) salts, (GIBCO, BRL         11117-074), 0.5 mg/L nicotinic acid, 0.1 mg/L thiamine HCl, 0.5         mg/L pyridoxine HCl, 2.0 mg/L glycine, 0.1 g/L myo-inositol, 0.5         mg/L zeatin (Sigma, Cat. No. Z-0164), 1 mg/L indole acetic acid         (IAA), 26.4 μg/L abscisic acid (ABA), 60 g/L sucrose, 3 mg/L         bialaphos (filter-sterilized), 100 mg/L carbenicillin         (filter-sterilized), 8 g/L agar, pH 5.6.     -   6. PHI-F: PHI-E without zeatin, IAA, ABA; reduce sucrose to 40         g/L; replacing agar with 1.5 g/L GELRITE®; pH 5.6.

Plants can be regenerated from the transgenic callus by first transferring clusters of tissue to N6 medium supplemented with 0.2 mg per liter of 2,4-D. After two weeks the tissue can be transferred to regeneration medium (Fromm et al., Bio/Technology 8:833-839 (1990)).

Transgenic T0 plants can be regenerated and their phenotype determined. T1 seed can be collected.

T1 plants can be grown under nitrogen limiting conditions, for example 1 mM nitrate, and analyzed for phenotypic changes. The following parameters can be quantified using image analysis: plant area, volume, growth rate and color analysis can be collected and quantified. Overexpression constructs that result in an alteration, compared to suitable control plants, in greenness (green color bin), yield, growth rate, biomass, fresh or dry weight at maturation, fruit or seed yield, total plant nitrogen content, fruit or seed nitrogen content, nitrogen content in vegetative tissue, free amino acid content in the whole plant, free amino acid content in vegetative tissue, free amino acid content in the fruit or seed, protein content in the fruit or seed, or protein content in a vegetative tissue can be considered evidence that the Arabidopsis lead gene functions in maize to enhance tolerance to nitrogen deprivation (increased nitrogen tolerance).

Furthermore, a recombinant DNA construct containing a validated Arabidopsis gene can be introduced into a maize inbred line either by direct transformation or introgression from a separately transformed line.

Example 14A Preparation of Expression Vector for Transformation of Maize Lines with Validated Candidate Arabidopsis Gene (At5g50930) Using Agrobacterium

Using the INVITROGEN™ GATEWAY® technology, an LR Recombination Reaction was performed with the GATEWAY® entry clone containing the Arabidopsis Int2-2 (described in Example 5), entry clone PHP23112 (SEQ ID NO:14), entry clone PHP20234 (SEQ ID NO:9; FIG. 9) and destination vector PHP22655 (SEQ ID NO:10) to generate the precursor plasmid PHP28699. Likewise, an LR Recombination Reaction was performed with the GATEWAY® entry clone containing the Arabidopsis Int2-2 (described in Example 5), entry clone PHP23112 (SEQ ID NO:14), entry clone PHP20234 (SEQ ID NO:9; FIG. 9) and destination vector PHP22655 (SEQ ID NO:10) to generate the precursor plasmid PHP28700. PHP28699 and PHP28700 each contain the following expression cassettes:

1. Ubiquitin promoter::moPAT::PinII terminator cassette expressing the PAT herbicide resistance gene used for selection during the transformation process.

2. LTP2 promoter::DS-RED2::PinII terminator cassette expressing the DS-RED color marker gene used for seed sorting.

In addition, PHP28699 contains the Ubiquitin promoter:Int2-2::PinII terminator cassette overexpressing the Arabidopsis LNT2-2, and PHP28700 contains the Ubiquitin promoter:Int2-3::PinII terminator cassette overexpressing the Arabidopsis LNT2-3.

Example 14B Transformation of Maize Lines with Validated Candidate Arabidopsis Gene (At5q50930) Using Agrobacterium

The LNT2-2 expression cassette present in vector PHP28699 (described in Example 14A) can be introduced into a maize inbred line, or a transformable maize line derived from an elite maize inbred line, using Agrobacterium-mediated transformation as described in Examples 12 and 13. The same procedures can also be used to introduce the LNT2-3 expression cassette present in PHP28700 into a maize inbred line, or a transformable maize line derived from an elite maize inbred line.

Expression vector PHP28699 can be electroporated into the LBA4404 Agrobacterium strain containing vector PHP10523 (SEQ ID NO:7, FIG. 7) to create the co-integrate vector PHP28841, which contains the Int2-2 expression cassette. The co-integrate vector is formed by recombination of the two plasmids, PHP28699 and PHP10523, through the COS recombination sites contained on each vector and contains the same three expression cassettes as above (Example 14A) in addition to other genes (TET, TET, TRFA, OR1 terminator, CTL, ORI V, VIR C1, VIR C2, VIR G, VIR B) needed for the Agrobacterium strain and the Agrobacterium-mediated transformation. Similarly, expression vector PHP28700 can be electroporated into the LBA4404 Agrobacterium strain containing vector PHP10523 (SEQ ID NO:7, FIG. 7) to create the co-integrate vector PHP28840, which contains the Int2-3 expression cassette. The electroporation protocol in, but not limited to, Example 12 may be used.

Example 15 Preparation of the Destination Vector PHP23236 for Transformation into Gaspe Flint derived Maize Lines

Destination vector PHP23236 (FIG. 6; SEQ ID NO:6) was obtained by transformation of Agrobacterium strain LBA4404 containing PHP10523 (FIG. 7; SEQ ID NO:7) with vector PHP23235 (FIG. 8; SEQ ID NO:8) and isolation of the resulting co-integration product.

Destination vector PHP23236 can be used in a recombination reaction with an entry clone, as described in Example 16, to create a maize expression vector for transformation of Gaspe Flint derived maize lines.

Example 16 Preparation of Expression Constructs for Transformation into Gaspe Flint Derived Maize Lines

Using the INVITROGEN™ GATEWAY® LR Recombination technology, the same entry clones described in Example 5 can be used to directionally clone the expression cassettes into the GATEWAY® destination vector PHP23236 (SEQ ID NO:6; FIG. 6) to create corresponding expression vectors. Expression vectors PHP29694 and PHP29689 contain Int2-2 (SEQ ID NO:29) and Int2-3 (SEQ ID NO:31), respectively. Each expression vector contains the cDNA of interest under control of the UBI promoter and is a T-DNA binary for Agrobacterium-mediated transformation into maize as described, but not limited to, the examples described herein.

Example 17A Transformation of Gaspe Flint Derived Maize Lines with Validated Candidate Arabidopsis Gene (At5g50930)

Maize plants can be transformed to overexpress the Arabidopsis At5g50930 gene (and the corresponding homologs from other species) in order to examine the resulting phenotype. Expression constructs such as the one described in Example 16 may be used.

Recipient Plants

Recipient plant cells can be from a uniform maize line having a short life cycle (“fast cycling”), a reduced size, and high transformation potential. Typical of these plant cells for maize are plant cells from any of the publicly available Gaspe Flint (GF) line varieties. One possible candidate plant line variety is the F1 hybrid of GF×QTM (Quick Turnaround Maize, a publicly available form of Gaspe Flint selected for growth under greenhouse conditions) disclosed in Tomes et al. (U.S. application Ser. No. 10/367,416 filed Feb. 13, 2003; U.S. Patent Publication No. 2003/0221212 A1 published Nov. 27, 2003). Transgenic plants obtained from this line are of such a reduced size that they can be grown in four inch pots (¼ the space needed for a normal sized maize plant) and mature in less than 2.5 months. (Traditionally 3.5 months is required to obtain transgenic T0 seed once the transgenic plants are acclimated to the greenhouse.) Another suitable line includes but is not limited to a double haploid line of GS3 (a highly transformable line)×Gaspe Flint. Yet another suitable line is a transformable elite maize inbred line carrying a transgene which causes early flowering, reduced stature, or both.

Transformation Protocol

Any suitable method may be used to introduce the transgenes into the maize cells, including but not limited to inoculation type procedures using Agrobacterium based vectors (see, for example, Examples 12 and 13). Transformation may be performed on immature embryos of the recipient (target) plant.

Precision Growth and Plant Tracking

The event population of transgenic (T0) plants resulting from the transformed maize embryos is grown in a controlled greenhouse environment using a modified randomized block design to reduce or eliminate environmental error. A randomized block design is a plant layout in which the experimental plants are divided into groups (e.g., thirty plants per group), referred to as blocks, and each plant is randomly assigned a location within the block.

For a group of thirty plants, twenty-four transformed, experimental plants and six control plants (plants with a set phenotype) (collectively, a “replicate group”) are placed in pots which are arranged in an array (a.k.a. a replicate group or block) on a table located inside a greenhouse. Each plant, control or experimental, is randomly assigned to a location within the block which is mapped to a unique, physical greenhouse location as well as to the replicate group. Multiple replicate groups of thirty plants each may be grown in the same greenhouse in a single experiment. The layout (arrangement) of the replicate groups should be determined to minimize space requirements as well as environmental effects within the greenhouse. Such a layout may be referred to as a compressed greenhouse layout.

An alternative to the addition of a specific control group is to identify those transgenic plants that do not express the gene of interest. A variety of techniques such as RT-PCR can be applied to quantitatively assess the expression level of the introduced gene. T0 plants that do not express the transgene can be compared to those which do.

Each plant in the event population is identified and tracked throughout the evaluation process, and the data gathered from that plant is automatically associated with that plant so that the gathered data can be associated with the transgene carried by the plant. For example, each plant container can have a machine readable label (such as a Universal Product Code (UPC) bar code) which includes information about the plant identity, which in turn is correlated to a greenhouse location so that data obtained from the plant can be automatically associated with that plant.

Alternatively any efficient, machine readable, plant identification system can be used, such as two-dimensional matrix codes or even radio frequency identification tags (RFID) in which the data is received and interpreted by a radio frequency receiver/processor. See U.S. application Ser. No. 10/324,288 filed Dec. 19, 2002 (U.S. Patent Publication No. 2004/0122592 A1 published Jun. 24, 2004), incorporated herein by reference.

Phenotypic Analysis Using Three-Dimensional Imaging

Each greenhouse plant in the T0 event population, including any control plants, is analyzed for agronomic characteristics of interest, and the agronomic data for each plant is recorded or stored in a manner so that it is associated with the identifying data (see above) for that plant. Confirmation of a phenotype (gene effect) can be accomplished in the T1 generation with a similar experimental design to that described above.

The T0 plants are analyzed at the phenotypic level using quantitative, non-destructive imaging technology throughout the plant's entire greenhouse life cycle to assess the traits of interest. In an embodiment, a digital imaging analyzer is used for automatic multi-dimensional analyzing of total plants. The imaging may be done inside the greenhouse. Two camera systems, located at the top and side, and an apparatus to rotate the plant, are used to view and image plants from all sides. Images are acquired from the top, front and side of each plant. All three images together provide sufficient information to evaluate, for example, the biomass, size, and morphology of each plant.

Due to the change in size of the plants from the time the first leaf appears from the soil to the time the plants are at the end of their development, the early stages of plant development are In an embodiment documented with a higher magnification from the top. This imaging may be accomplished by using a motorized zoom lens system that is fully controlled by the imaging software.

In a single imaging analysis operation, the following events occur: (1) the plant is conveyed inside the analyzer area, rotated 360 degrees so its machine readable label can be read, and left at rest until its leaves stop moving; (2) the side image is taken and entered into a database; (3) the plant is rotated 90 degrees and again left at rest until its leaves stop moving, and (4) the plant is transported out of the analyzer.

Plants are allowed at least six hours of darkness per twenty four hour period in order to have a normal day/night cycle.

Imaging Instrumentation

Any suitable imaging instrumentation may be used, including but not limited to light spectrum digital imaging instrumentation commercially available from LemnaTec GmbH of Wurselen, Germany. The images are taken and analyzed with a LemnaTec Scanalyzer HTS LT-0001-2 having a ½″ IT Progressive Scan IEE CCD imaging device. The imaging cameras may be equipped with a motor zoom, motor aperture, and motor focus. All camera settings may be made using LemnaTec software. In an embodiment, the instrumental variance of the imaging analyzer is less than about 5% for major components and less than about 10% for minor components.

Software

The imaging analysis system comprises a LemnaTec HTS Bonit software program for color and architecture analysis and a server database for storing data from about 500,000 analyses, including the analysis dates. The original images and the analyzed images are stored together to allow the user to do as much reanalyzing as desired. The database can be connected to the imaging hardware for automatic data collection and storage. A variety of commercially available software systems (e.g., Matlab, others) can be used for quantitative interpretation of the imaging data, and any of these software systems can be applied to the image data set.

Conveyor System

A conveyor system with a plant rotating device may be used to transport the plants to the imaging area and rotate them during imaging. For example, up to four plants, each with a maximum height of 1.5 m, are loaded onto cars that travel over the circulating conveyor system and through the imaging measurement area. In this case the total footprint of the unit (imaging analyzer and conveyor loop) is about 5 m×5 m.

The conveyor system can be enlarged to accommodate more plants at a time. The plants are transported along the conveyor loop to the imaging area and are analyzed for up to 50 seconds per plant. Three views of the plant are taken. The conveyor system, as well as the imaging equipment, should be capable of being used in greenhouse environmental conditions.

Illumination

Any suitable mode of illumination may be used for the image acquisition. For example, a top light above a black background can be used. Alternatively, a combination of top- and backlight using a white background can be used. The illuminated area should be housed to ensure constant illumination conditions. The housing should be longer than the measurement area so that constant light conditions prevail without requiring the opening and closing or doors. Alternatively, the illumination can be varied to cause excitation of either transgene (e.g., green fluorescent protein (GFP), red fluorescent protein (RFP)) or endogenous (e.g. Chlorophyll) fluorophores).

Biomass Estimation Based on Three-Dimensional Imaging

For best estimation of biomass the plant images should be taken from at least three axes, In an embodiment the top and two side (sides 1 and 2) views. These images are then analyzed to separate the plant from the background, pot and pollen control bag (if applicable). The volume of the plant can be estimated by the calculation: Volume(voxels)=√{square root over (TopArea(pixels))}×√{square root over (Side1Area(pixels))}×√{square root over (Side2Area(pixels))}

In the equation above the units of volume and area are “arbitrary units”. Arbitrary units are entirely sufficient to detect gene effects on plant size and growth in this system because what is desired is to detect differences (both positive-larger and negative-smaller) from the experimental mean, or control mean. The arbitrary units of size (e.g. area) may be trivially converted to physical measurements by the addition of a physical reference to the imaging process. For instance, a physical reference of known area can be included in both top and side imaging processes. Based on the area of these physical references a conversion factor can be determined to allow conversion from pixels to a unit of area such as square centimeters (cm²). The physical reference may or may not be an independent sample. For instance, the pot, with a known diameter and height, could serve as an adequate physical reference.

Color Classification

The imaging technology may also be used to determine plant color and to assign plant colors to various color classes. The assignment of image colors to color classes is an inherent feature of the LemnaTec software. With other image analysis software systems color classification may be determined by a variety of computational approaches.

For the determination of plant size and growth parameters, a useful classification scheme is to define a simple color scheme including two or three shades of green (In an embodiment hues 50-66, see FIG. 12) and, in addition, a color class for chlorosis, necrosis and bleaching, should these conditions occur. A background color class which includes non plant colors in the image (for example pot and soil colors) is also used and these pixels are specifically excluded from the determination of size. The plants are analyzed under controlled constant illumination so that any change within one plant over time, or between plants or different batches of plants (e.g. seasonal differences) can be quantified.

In addition to its usefulness in determining plant size growth, color classification can be used to assess other yield component traits. For these other yield component traits additional color classification schemes may be used. For instance, the trait known as “staygreen”, which has been associated with improvements in yield, may be assessed by a color classification that separates shades of green from shades of yellow and brown (which are indicative of senescing tissues). By applying this color classification to images taken toward the end of the T0 or T1 plants' life cycle, plants that have increased amounts of green colors relative to yellow and brown colors (expressed, for instance, as Green/Yellow Ratio) may be identified. Plants with a significant difference in this Green/Yellow ratio can be identified as carrying transgenes which impact this important agronomic trait.

The skilled plant biologist will recognize that other plant colors arise which can indicate plant health or stress response (for instance anthocyanins), and that other color classification schemes can provide further measures of gene action in traits related to these responses.

Plant Architecture Analysis

Transgenes which modify plant architecture parameters may also be identified using the present invention, including such parameters as maximum height and width, internodal distances, angle between leaves and stem, number of leaves starting at nodes, and leaf length. The LemnaTec system software may be used to determine plant architecture as follows. The plant is reduced to its main geometric architecture in a first imaging step and then, based on this image, parameterized identification of the different architecture parameters can be performed. Transgenes that modify any of these architecture parameters either singly or in combination can be identified by applying the statistical approaches previously described.

Pollen Shed Date

Pollen shed date is an important parameter to be analyzed in a transformed plant, and may be determined by the first appearance on the plant of an active male flower. To find the male flower object, the upper end of the stem is classified by color to detect yellow or violet anthers. This color classification analysis is then used to define an active flower, which in turn can be used to calculate pollen shed date.

Alternatively, pollen shed date and other easily visually detected plant attributes (e.g., pollination date, first silk date) can be recorded by the personnel responsible for performing plant care. To maximize data integrity and process efficiency, this data is tracked by utilizing the same barcodes utilized by the LemnaTec light spectrum digital analyzing device. A computer with a barcode reader, a palm device, or a notebook PC may be used for ease of data capture recording time of observation, plant identifier, and the operator who captured the data.

Orientation of the Plants

Mature maize plants grown at densities approximating commercial planting often have a planar architecture. That is, the plant has a clearly discernable broad side, and a narrow side. The image of the plant from the broadside is determined. To each plant a well defined basic orientation is assigned to obtain the maximum difference between the broadside and edgewise images. The top image is used to determine the main axis of the plant, and an additional rotating device is used to turn the plant to the appropriate orientation prior to starting the main image acquisition.

Example 17B Transformation of Gaspe Flint Derived Maize Lines with Maize Homolog

Using the INVITROGEN™ GATEWAY® LR Recombination technology, an entry clone may be created for the maize homolog (SEQ ID NO:17) (see Example 5 for entry clone preparation) and can be directionally cloned into the GATEWAY® destination vector PHP23236 (SEQ ID NO:6; FIG. 6) to create an expression vector PHP30115. This expression vector now contains the cDNA of interest under control of the UBI promoter and is a T-DNA binary for Agrobacterium-mediated transformation into maize as described, but not limited to, the examples described herein.

Example 18 Screening of Gaspe Flint Derived Maize Lines Under Optimal and Reduced Nitrogen Conditions

Transgenic plants contain two or three doses of Gaspe Flint-3 with one dose of GS3 (GS3/(Gaspe-3)2× or GS3/(Gaspe-3)3×) and segregate 1:1 for a dominant transgene. Transgenic plants containing PHP29689 (expression cassette=Int2-3) were planted in 100% Turface in classic 200 pots. Plants were watered with 1.0 mM KNO₃ growth medium (see FIG. 13) until segregant determination. At 8 DAP (days after planting), seedlings were randomized and placed equally into respective treatment groups. Two treatments were applied: optimal (6.5 mMol KNO₃) and reduced nitrogen (1.0 mMol KNO₃), twice daily until 13 DAP. The daily irrigation schedule consisted of a 9:00 AM, 12:00 PM, and 3:00 PM nutrient watering for 3 minutes (156 ml) between 13 and 24 DAP. A fourth watering was added at 5:00 AM on 25 DAP, and a fifth watering was added at 5:00 PM on 31 DAP. pH was monitored at least three times weekly for each table, and days to emergence and days to shed were recorded. Imaging to assess surface area accumulation, specific growth rates (sgr), and changes in color, was performed for each plant three times per week (Monday, Wednesday, and Friday). Plants were sampled for ELISA MOPAT on 8 DAP and for expression and metabolic profiling analysis on 35 DAP. Fresh weight data was obtained from harvested tissue, obtained at 37 DAP, and the harvested tissue was then oven dried (70° C. for 120 hrs.) to obtain dry weight data.

Four events for PHP29689 were evaluated (FIG. 16). The probability of a greater Student's t test was calculated for each transgenic mean compared to the appropriate null mean (either segregant null or construct null). A minimum (P<t) of 0.1 was used as a cut off. Table 5 shows the variables for each event that were significantly increased, as compared to the segregant nulls.

TABLE 5 PHP29689 event summary Event Reduced nitrogen Optimal nitrogen EA2391.314.1.5 % light green end % light green end exponential exponential % light green harvest day Ear diameter Total area harvest day Ear dry weight Days to shed Ear fresh weight Maximum total area Specific growth rate Shoot fresh rate EA2391.314.1.6 Total area end % light green end exponential exponential Total area harvest day % light green harvest day Maximum total area Total area end exponential Shoot dry weight Total area harvest day Shoot fresh weight Maximum total area Shoot + ear dry weight Specific growth rate Shoot + ear fresh weight Shoot dry weight Stalk + ear diameter Shoot fresh weight Shoot + ear dry weight Shoot + ear fresh weight EA2391.314.1.8 Days to shed % light green end Specific growth rate exponential Shoot fresh weight % light green harvest day Shoot + ear fresh weight Days to shed Specific growth rate EA2391.314.1.9 % light green end exponential % light green harvest day Total area harvest day Maximum total area Specific growth rate

When all events were considered relative to the construct null (FIG. 17), the construct, on average, evinced a significant increase over the construct null for a number of variables (data summarized in Table 6).

TABLE 6 PHP29689 construct summary Reduced nitrogen Optimal nitrogen % light green harvest day % light green end exponential Total area harvest day % light green harvest day Days to shed Total area end exponential Max total area Total area harvest day Specific growth rate Days to shed Shoot fresh weight Max total area Specific growth rate Shoot dry weight Shoot fresh weight Shoot + ear dry weight Shoot + ear fresh weight

Example 19 Yield Analysis of Maize Lines with the Arabidopsis Lead Genes

Transgenic plants, either inbreds or topcross hybrids, can undergo more vigorous field-based experiments to study yield enhancement and/or stability under nitrogen limiting and non-limiting conditions. For example, yield analysis can be done to determine whether plants that contain a validated Arabidopsis Int2-2 or Int2-3 gene have an improvement in yield performance (under nitrogen limiting or non-limiting conditions), when compared to the control (or reference) plants, that are either construct null or wild-type. Nitrogen limiting conditions are provided by a combination of previous fertility practices in which nitrogen is applied at reduced levels for one or more years where corn or an alternative crop is grown and the seed crop is removed each season. Under such conditions, a low nitrogen (LN) environment consists of a less than normal amount of nitrogen fertilizer applied in early spring or summer, whereas a normal nitrogen (NN) environment consists of adding adequate nitrogen for normal yields, based on soil test standards established for specific growing areas by Federal and State Extension services.

Corn hybrid testcrosses, containing either the validated Arabidopsis Int2-2 or Int2-3 gene, and their controls were grown in LN and NN environments in Woodland, Calif., and in Johnston, Iowa, and yield was assessed. Yield reduction was observed in LN environments compared to that obtained in NN environments. Yields of the corn hybrid testcrosses, containing either the validated Arabidopsis Int2-2 or Int2-3 gene, were compared to that of the construct nulls. The results of these yield trials are shown in FIGS. 18-21.

Individual events of plants containing PHP28840 (expression cassette=Int2-3) showed significantly increased yield under LN conditions in 2007 for events E6919.105.1.11 and E6919.105.1.21 in Woodland, while the E6919.105.1.21 event tested in Johnston in 2007 was numerically higher in yield. Similar testing in 2008 revealed significantly improved yield for event E6919.105.1.21 in both Woodland and Johnston and for events E6919.105.1.2 and E6919.105.1.24, in Woodland and in Johnston, respectively. The results for PHP28840-containing plants under low nitrogen conditions are shown in FIG. 18

Under normal nitrogen (NN) treatments, event E6919.105.1.11 was similar in yield to the construct null (not statistically different) in both Woodland and Johnston in 2007, suggesting that under higher nitrogen levels, this event retains high yield potential. A similar result was obtained in 2008 at the Woodland location. In contrast, event E3919.105.1.11 in Johnston in 2008 and events E6919.105.1.21 and E6919.105.1.24 in Johnston in 2007 and 2008 had significantly lower yields. The results for PHP28840-containing plants under normal nitrogen conditions are shown in FIG. 20.

Individual events of plants containing PHP28841 (expression cassette=Int2-2) showed a statistically significant increase in yield for events E6919.106.1.17 and E6919.106.1.3 under LN conditions in Woodland in 2007. However, in Johnston in 2007 under LN conditions, event E6919.106.1.3 showed significantly lower yields, and yields were not collected for event E6919.106.1.17. The results for PHP28841-containing plants under low nitrogen (LN) conditions are shown in FIG. 19.

Under normal nitrogen (NN) treatments, E6919.106.1.17 had numerically higher yields in both Woodland and Johnston in 2007, as compared to the construct null, while event E6919.106.1.3 showed a significant increase in yield in Woodland in 2007 and a numerical increase in Johnston in 2007. Events E6919.106.1.22 and E619.106.1.8 showed significant decreases in yield in Woodland. The results for PHP28841-containing plants under normal nitrogen (NN) conditions are shown in FIG. 21.

Example 20 NUE Maize Seedling Assay

Seed of transgenic events (having construct PHP28841 or PHP28840) were separated into transgene (heterozygous) and null seed using a seed color marker. Two different random assignments of treatments were made to each block of 54 pots, which were arranged 6 rows by 9 columns using 9 replicates of all treatments. In one case, 4 null seed of 5 events of the same construct were mixed and used as a bulked control for comparisons of the 5 positive events in this block, making up 6 treatment combinations in each block. In the second case, 3 transgenic positive treatments and their corresponding nulls were randomly assigned to the 54 pots of the block, making 6 treatment combinations (3 positive and corresponding nulls) for each block, containing 9 replicates of all treatment combinations. In the first case, transgenic parameters were compared to a bulked construct null; in the second case, transgenic parameters were compared to the corresponding event null. In cases where there were 10, 15, or 20 events per construct, the events were assigned in groups of 5 events and the variances were calculated for each block of 54 pots. However, the block null means were pooled across blocks before transgenic mean comparisons were made.

For each treatment, two seeds were planted in a 4 inch square pot containing Turface, on 8 inch, staggered centers. The pots were watered four times each day with a solution containing the following nutrients: 1 mM CaCl₂, 2 mM MgSO₄, 0.5 mM KH₂PO₄, 83 ppm Sprint330, 3 mM KCl, 1 mM KNO₃, 1 μM ZnSO₄, 1 μM MnCl₂, 3 μM H₃BO₄, 0.1 μM CuSO₄, and 0.1 μM NaMoO₄.

After emergence, the plants were thinned to one seed per pot. Treatments were routinely planted on a Monday, and the plants emerged the following Friday.

The plants were then harvested 18 days after planting. At harvest, plants were removed from the pots, and the Turface was washed from the roots. The roots were separated from the shoot, placed in a paper bag and dried at 70° C. for 70 hr. The dried plant parts (roots and shoots) were weighed and placed in a 50 ml conical tube with approximately 20 5/32 inch steel balls and then ground by shaking in a paint shaker. Approximately, 30 mg of the ground tissue (weight recorded for later adjustment) was hydrolyzed in 2 ml of 20% H₂O₂ and 6M H₂SO₄ for 30 min at 170° C. After cooling, water was added to 20 ml, and the solution was mixed thoroughly. A 50 μl aliquot was removed and added to 950 μl 1M Na₂CO₃. The ammonia in this solution was used to estimate total reduced plant nitrogen by placing 100 μl of this solution into individual wells of a 96 well plate and then adding 50 μl of OPA solution. Fluorescence, excitation=360 nM/emission=530 nM, was determined and compared to NH₄Cl standards dissolved in a similar solution and treated with OPA solution.

The following solutions were used in the aforementioned experiments:

OPA solution—5 μl Mercaptoethanol+1 ml OPA stock solution (make fresh, daily)

OPA stock—50 mg o-phthadialdehyde (OPA—Sigma #P0657) dissolved in 1.5 ml methanol+4.4 ml 1M Borate buffer pH9.5 (3.09 g H₃BO₄+1g NaOH in 50 ml water)+0.55 ml 20% SDS (made fresh weekly)

The following parameters were measured, and the means were compared to null mean parameters using a Student's t test: SPAD (greenness), stem diameter, root dry weight, shoot dry weight, total dry weight, and plant N concentration. Variance was calculated within each block using a nearest neighbor calculation as well as by Analysis of Variance (ANOVA) using a completely random design (CRD) model. An overall treatment effect for each block was calculated using an F statistic, by dividing overall block treatment mean square by the overall block error mean square. The probability of a greater Student's t test was calculated for each transgenic mean compared to the appropriate null (either construct bulked or individual event null mean) mean. A minimum (P<t) of 0.1 was used as a cut off.

The results of the NUE seedling assay for the PHP28840 (expression cassette=Int2-3) and PHP28841 (expression cassette=Int2-2) constructs are shown in FIG. 22. Event E6919.105.1.21, which contains the UBI:Int2-3 expression cassette, showed a statistically significant increase in the following: shoot dry weight, nitrogen concentration, and total N. Another event with the UBI:Int2-3 expression cassette and four out of six events with the UBI:Int2-2 expression cassette evinced a statistically significant increase in plant N concentration. In addition, two out of six events containing the UBI:Int2-2 expression cassette showed a statistically significant increase in total N.

Example 21 Transformation and Evaluation of Soybean with Soybean Homologs of Validated Lead Genes

Based on homology searches, one or several candidate soybean homologs of validated Arabidopsis leads can be identified and also be assessed for their ability to enhance tolerance to nitrogen limiting conditions in soybean. Vector construction, plant transformation and phenotypic analysis will be similar to that in previously described Examples.

Example 22 Transformation and Evaluation of Maize with Maize Homologs of Validated Lead Genes

Based on homology searches, one or several candidate maize homologs of validated Arabidopsis lead genes can be identified (e.g., SEQ ID NOs:18 and 20) and also be assessed for their ability to enhance tolerance to nitrogen limiting conditions in maize. Vector construction, plant transformation and phenotypic analysis can be similar to that in previously described Examples.

Example 23 Transformation of Arabidopsis with Maize and Soybean Homologs of Validated Lead Genes

Soybean and maize homologs to validated Arabidopsis lead genes can be transformed into Arabidopsis under control of the 35S promoter and assayed for leaf area and green color bin accumulation when grown on low nitrogen medium. Vector construction and plant transformation can be as described in the examples herein. Assay conditions, data capture and data analysis can be similar to that in previously described Examples. 

1. A method of increasing nitrogen stress tolerance in a plant, comprising: (a) introducing into a regenerable plant cell a recombinant DNA construct comprising a polynucleotide operably linked to at least one regulatory sequence, wherein the polynucleotide encodes a polypeptide having an amino acid sequence of at least 98% sequence identity, based on the Clustal V method of alignment, when compared to SEQ ID NO:32; and (b) regenerating a transgenic plant from the regenerable plant cell after step (a), wherein the transgenic plant comprises in its genome the recombinant DNA construct; the polynucleotide is expressed in the transgenic plant; and the transgenic plant exhibits increased nitrogen stress tolerance when compared to a control plant not comprising the recombinant DNA construct.
 2. The method of claim 1, further comprising: (c) obtaining a progeny plant from the transgenic plant, wherein said progeny plant comprises in its genome the recombinant DNA construct; the polynucleotide is expressed in the progeny plant; and the progeny plant exhibits increased nitrogen stress tolerance when compared to a control plant not comprising the recombinant DNA construct. 